path: root/devel/bmake/files/bmake.cat1

BMAKE(1)                NetBSD General Commands Manual                BMAKE(1)

NNAAMMEE
     bbmmaakkee -- maintain program dependencies

SSYYNNOOPPSSIISS
     bbmmaakkee [--BBeeiikkNNnnqqrrssttWWXX] [--CC _d_i_r_e_c_t_o_r_y] [--DD _v_a_r_i_a_b_l_e] [--dd _f_l_a_g_s]
           [--ff _m_a_k_e_f_i_l_e] [--II _d_i_r_e_c_t_o_r_y] [--JJ _p_r_i_v_a_t_e] [--jj _m_a_x___j_o_b_s]
           [--mm _d_i_r_e_c_t_o_r_y] [--TT _f_i_l_e] [--VV _v_a_r_i_a_b_l_e] [_v_a_r_i_a_b_l_e_=_v_a_l_u_e]
           [_t_a_r_g_e_t _._._.]

DDEESSCCRRIIPPTTIIOONN
     bbmmaakkee is a program designed to simplify the maintenance of other
     programs.  Its input is a list of specifications as to the files upon
     which programs and other files depend.  If no --ff _m_a_k_e_f_i_l_e makefile option
     is given, bbmmaakkee will try to open `_m_a_k_e_f_i_l_e' then `_M_a_k_e_f_i_l_e' in order to
     find the specifications.  If the file `_._d_e_p_e_n_d' exists, it is read (see
     mkdep(1)).

     This manual page is intended as a reference document only.  For a more
     thorough description of bbmmaakkee and makefiles, please refer to _M_a_k_e _- _A
     _T_u_t_o_r_i_a_l.

     bbmmaakkee will prepend the contents of the _M_A_K_E_F_L_A_G_S environment variable to
     the command line arguments before parsing them.

     The options are as follows:

     --BB      Try to be backwards compatible by executing a single shell per
             command and by executing the commands to make the sources of a
             dependency line in sequence.

     --CC _d_i_r_e_c_t_o_r_y
             Change to _d_i_r_e_c_t_o_r_y before reading the makefiles or doing
             anything else.  If multiple --CC options are specified, each is
             interpreted relative to the previous one: --CC _/ --CC _e_t_c is
             equivalent to --CC _/_e_t_c.

     --DD _v_a_r_i_a_b_l_e
             Define _v_a_r_i_a_b_l_e to be 1, in the global context.

     --dd _[_-_]_f_l_a_g_s
             Turn on debugging, and specify which portions of bbmmaakkee are to
             print debugging information.  Unless the flags are preceded by
             `-' they are added to the _M_A_K_E_F_L_A_G_S environment variable and will
             be processed by any child make processes.  By default, debugging
             information is printed to standard error, but this can be changed
             using the _F debugging flag.  The debugging output is always
             unbuffered; in addition, if debugging is enabled but debugging
             output is not directed to standard output, then the standard
             output is line buffered.  _F_l_a_g_s is one or more of the following:

             _A       Print all possible debugging information; equivalent to
                     specifying all of the debugging flags.

             _a       Print debugging information about archive searching and
                     caching.

             _C       Print debugging information about current working
                     directory.

             _c       Print debugging information about conditional evaluation.

             _d       Print debugging information about directory searching and
                     caching.

             _e       Print debugging information about failed commands and
                     targets.

             _F[++]_f_i_l_e_n_a_m_e
                     Specify where debugging output is written.  This must be
                     the last flag, because it consumes the remainder of the
                     argument.  If the character immediately after the `F'
                     flag is `+', then the file will be opened in append mode;
                     otherwise the file will be overwritten.  If the file name
                     is `stdout' or `stderr' then debugging output will be
                     written to the standard output or standard error output
                     file descriptors respectively (and the `+' option has no
                     effect).  Otherwise, the output will be written to the
                     named file.  If the file name ends `.%d' then the `%d' is
                     replaced by the pid.

             _f       Print debugging information about loop evaluation.

             _g_1      Print the input graph before making anything.

             _g_2      Print the input graph after making everything, or before
                     exiting on error.

             _g_3      Print the input graph before exiting on error.

             _j       Print debugging information about running multiple
                     shells.

             _l       Print commands in Makefiles regardless of whether or not
                     they are prefixed by `@' or other "quiet" flags.  Also
                     known as "loud" behavior.

             _m       Print debugging information about making targets,
                     including modification dates.

             _n       Don't delete the temporary command scripts created when
                     running commands.  These temporary scripts are created in
                     the directory referred to by the TMPDIR environment
                     variable, or in _/_t_m_p if TMPDIR is unset or set to the
                     empty string.  The temporary scripts are created by
                     mkstemp(3), and have names of the form _m_a_k_e_X_X_X_X_X_X.  _N_O_T_E:
                     This can create many files in TMPDIR or _/_t_m_p, so use with
                     care.

             _p       Print debugging information about makefile parsing.

             _s       Print debugging information about suffix-transformation
                     rules.

             _t       Print debugging information about target list
                     maintenance.

             _v       Print debugging information about variable assignment.

             _x       Run shell commands with --xx so the actual commands are
                     printed as they are executed.

     --ee      Specify that environment variables override macro assignments
             within makefiles.

     --ff _m_a_k_e_f_i_l_e
             Specify a makefile to read instead of the default `_m_a_k_e_f_i_l_e'.  If
             _m_a_k_e_f_i_l_e is `--', standard input is read.  Multiple makefiles may
             be specified, and are read in the order specified.

     --II _d_i_r_e_c_t_o_r_y
             Specify a directory in which to search for makefiles and included
             makefiles.  The system makefile directory (or directories, see
             the --mm option) is automatically included as part of this list.

     --ii      Ignore non-zero exit of shell commands in the makefile.
             Equivalent to specifying `--' before each command line in the
             makefile.

     --JJ _p_r_i_v_a_t_e
             This option should _n_o_t be specified by the user.

             When the _j option is in use in a recursive build, this option is
             passed by a make to child makes to allow all the make processes
             in the build to cooperate to avoid overloading the system.

     --jj _m_a_x___j_o_b_s
             Specify the maximum number of jobs that bbmmaakkee may have running at
             any one time.  Turns compatibility mode off, unless the _B flag is
             also specified.  When compatibility mode is off, all commands
             associated with a target are executed in a single shell
             invocation as opposed to the traditional one shell invocation per
             line.  This can break traditional scripts which change
             directories on each command invocation and then expect to start
             with a fresh environment on the next line.  It is more efficient
             to correct the scripts rather than turn backwards compatibility
             on.

     --kk      Continue processing after errors are encountered, but only on
             those targets that do not depend on the target whose creation
             caused the error.

     --mm _d_i_r_e_c_t_o_r_y
             Specify a directory in which to search for sys.mk and makefiles
             included via the <_f_i_l_e>-style include statement.  The --mm option
             can be used multiple times to form a search path.  This path will
             override the default system include path: /usr/share/mk.
             Furthermore the system include path will be appended to the
             search path used for "_f_i_l_e"-style include statements (see the --II
             option).

             If a file or directory name in the --mm argument (or the
             MAKESYSPATH environment variable) starts with the string ".../"
             then bbmmaakkee will search for the specified file or directory named
             in the remaining part of the argument string.  The search starts
             with the current directory of the Makefile and then works upward
             towards the root of the filesystem.  If the search is successful,
             then the resulting directory replaces the ".../" specification in
             the --mm argument.  If used, this feature allows bbmmaakkee to easily
             search in the current source tree for customized sys.mk files
             (e.g., by using ".../mk/sys.mk" as an argument).

     --nn      Display the commands that would have been executed, but do not
             actually execute them unless the target depends on the .MAKE
             special source (see below).

     --NN      Display the commands which would have been executed, but do not
             actually execute any of them; useful for debugging top-level
             makefiles without descending into subdirectories.

     --qq      Do not execute any commands, but exit 0 if the specified targets
             are up-to-date and 1, otherwise.

     --rr      Do not use the built-in rules specified in the system makefile.

     --ss      Do not echo any commands as they are executed.  Equivalent to
             specifying `@@' before each command line in the makefile.

     --TT _t_r_a_c_e_f_i_l_e
             When used with the --jj flag, append a trace record to _t_r_a_c_e_f_i_l_e
             for each job started and completed.

     --tt      Rather than re-building a target as specified in the makefile,
             create it or update its modification time to make it appear
             up-to-date.

     --VV _v_a_r_i_a_b_l_e
             Print bbmmaakkee's idea of the value of _v_a_r_i_a_b_l_e, in the global
             context.  Do not build any targets.  Multiple instances of this
             option may be specified; the variables will be printed one per
             line, with a blank line for each null or undefined variable.  If
             _v_a_r_i_a_b_l_e contains a `$' then the value will be expanded before
             printing.

     --WW      Treat any warnings during makefile parsing as errors.

     --XX      Don't export variables passed on the command line to the
             environment individually.  Variables passed on the command line
             are still exported via the _M_A_K_E_F_L_A_G_S environment variable.  This
             option may be useful on systems which have a small limit on the
             size of command arguments.

     _v_a_r_i_a_b_l_e_=_v_a_l_u_e
             Set the value of the variable _v_a_r_i_a_b_l_e to _v_a_l_u_e.  Normally, all
             values passed on the command line are also exported to sub-makes
             in the environment.  The --XX flag disables this behavior.
             Variable assignments should follow options for POSIX
             compatibility but no ordering is enforced.

     There are seven different types of lines in a makefile: file dependency
     specifications, shell commands, variable assignments, include statements,
     conditional directives, for loops, and comments.

     In general, lines may be continued from one line to the next by ending
     them with a backslash (`\').  The trailing newline character and initial
     whitespace on the following line are compressed into a single space.

FFIILLEE DDEEPPEENNDDEENNCCYY SSPPEECCIIFFIICCAATTIIOONNSS
     Dependency lines consist of one or more targets, an operator, and zero or
     more sources.  This creates a relationship where the targets ``depend''
     on the sources and are usually created from them.  The exact relationship
     between the target and the source is determined by the operator that
     separates them.  The three operators are as follows:

     ::     A target is considered out-of-date if its modification time is less
           than those of any of its sources.  Sources for a target accumulate
           over dependency lines when this operator is used.  The target is
           removed if bbmmaakkee is interrupted.

     !!     Targets are always re-created, but not until all sources have been
           examined and re-created as necessary.  Sources for a target
           accumulate over dependency lines when this operator is used.  The
           target is removed if bbmmaakkee is interrupted.

     ::::    If no sources are specified, the target is always re-created.
           Otherwise, a target is considered out-of-date if any of its sources
           has been modified more recently than the target.  Sources for a
           target do not accumulate over dependency lines when this operator
           is used.  The target will not be removed if bbmmaakkee is interrupted.

     Targets and sources may contain the shell wildcard values `?', `*', `[]',
     and `{}'.  The values `?', `*', and `[]' may only be used as part of the
     final component of the target or source, and must be used to describe
     existing files.  The value `{}' need not necessarily be used to describe
     existing files.  Expansion is in directory order, not alphabetically as
     done in the shell.

SSHHEELLLL CCOOMMMMAANNDDSS
     Each target may have associated with it a series of shell commands,
     normally used to create the target.  Each of the commands in this script
     _m_u_s_t be preceded by a tab.  While any target may appear on a dependency
     line, only one of these dependencies may be followed by a creation
     script, unless the `::::' operator is used.

     If the first characters of the command line are any combination of `@@',
     `++', or `--', the command is treated specially.  A `@@' causes the command
     not to be echoed before it is executed.  A `++' causes the command to be
     executed even when --nn is given.  This is similar to the effect of the
     .MAKE special source, except that the effect can be limited to a single
     line of a script.  A `--' causes any non-zero exit status of the command
     line to be ignored.

VVAARRIIAABBLLEE AASSSSIIGGNNMMEENNTTSS
     Variables in make are much like variables in the shell, and, by
     tradition, consist of all upper-case letters.

   VVaarriiaabbllee aassssiiggnnmmeenntt mmooddiiffiieerrss
     The five operators that can be used to assign values to variables are as
     follows:

     ==       Assign the value to the variable.  Any previous value is
             overridden.

     ++==      Append the value to the current value of the variable.

     ??==      Assign the value to the variable if it is not already defined.

     ::==      Assign with expansion, i.e. expand the value before assigning it
             to the variable.  Normally, expansion is not done until the
             variable is referenced.  _N_O_T_E: References to undefined variables
             are _n_o_t expanded.  This can cause problems when variable
             modifiers are used.

     !!==      Expand the value and pass it to the shell for execution and
             assign the result to the variable.  Any newlines in the result
             are replaced with spaces.

     Any white-space before the assigned _v_a_l_u_e is removed; if the value is
     being appended, a single space is inserted between the previous contents
     of the variable and the appended value.

     Variables are expanded by surrounding the variable name with either curly
     braces (`{}') or parentheses (`()') and preceding it with a dollar sign
     (`$').  If the variable name contains only a single letter, the
     surrounding braces or parentheses are not required.  This shorter form is
     not recommended.

     If the variable name contains a dollar, then the name itself is expanded
     first.  This allows almost arbitrary variable names, however names
     containing dollar, braces, parenthesis, or whitespace are really best
     avoided!

     If the result of expanding a variable contains a dollar sign (`$') the
     string is expanded again.

     Variable substitution occurs at three distinct times, depending on where
     the variable is being used.

     1.   Variables in dependency lines are expanded as the line is read.

     2.   Variables in shell commands are expanded when the shell command is
          executed.

     3.   ``.for'' loop index variables are expanded on each loop iteration.
          Note that other variables are not expanded inside loops so the
          following example code:


                .for i in 1 2 3
                a+=     ${i}
                j=      ${i}
                b+=     ${j}
                .endfor

                all:
                        @echo ${a}
                        @echo ${b}

          will print:

                1 2 3
                3 3 3

          Because while ${a} contains ``1 2 3'' after the loop is executed,
          ${b} contains ``${j} ${j} ${j}'' which expands to ``3 3 3'' since
          after the loop completes ${j} contains ``3''.

   VVaarriiaabbllee ccllaasssseess
     The four different classes of variables (in order of increasing
     precedence) are:

     Environment variables
             Variables defined as part of bbmmaakkee's environment.

     Global variables
             Variables defined in the makefile or in included makefiles.

     Command line variables
             Variables defined as part of the command line.

     Local variables
             Variables that are defined specific to a certain target.  The
             seven local variables are as follows:

             _._A_L_L_S_R_C   The list of all sources for this target; also known as
                       `_>'.

             _._A_R_C_H_I_V_E  The name of the archive file.

             _._I_M_P_S_R_C   In suffix-transformation rules, the name/path of the
                       source from which the target is to be transformed (the
                       ``implied'' source); also known as `_<'.  It is not
                       defined in explicit rules.

             _._M_E_M_B_E_R   The name of the archive member.

             _._O_O_D_A_T_E   The list of sources for this target that were deemed
                       out-of-date; also known as `_?'.

             _._P_R_E_F_I_X   The file prefix of the target, containing only the file
                       portion, no suffix or preceding directory components;
                       also known as `_*'.

             _._T_A_R_G_E_T   The name of the target; also known as `_@'.

             The shorter forms `_@', `_?', `_<', `_>', and `_*' are permitted for
             backward compatibility with historical makefiles and are not
             recommended.  The six variables `_@_F', `_@_D', `_<_F', `_<_D', `_*_F', and
             `_*_D' are permitted for compatibility with AT&T System V UNIX
             makefiles and are not recommended.

             Four of the local variables may be used in sources on dependency
             lines because they expand to the proper value for each target on
             the line.  These variables are `_._T_A_R_G_E_T', `_._P_R_E_F_I_X', `_._A_R_C_H_I_V_E',
             and `_._M_E_M_B_E_R'.

   AAddddiittiioonnaall bbuuiilltt--iinn vvaarriiaabblleess
     In addition, bbmmaakkee sets or knows about the following variables:

     _$               A single dollar sign `$', i.e.  `$$' expands to a single
                     dollar sign.

     _._A_L_L_T_A_R_G_E_T_S     The list of all targets encountered in the Makefile.  If
                     evaluated during Makefile parsing, lists only those
                     targets encountered thus far.

     _._C_U_R_D_I_R         A path to the directory where bbmmaakkee was executed.  Refer
                     to the description of `PWD' for more details.

     MAKE            The name that bbmmaakkee was executed with (_a_r_g_v_[_0_]).  For
                     compatibility bbmmaakkee also sets _._M_A_K_E with the same value.
                     The preferred variable to use is the environment variable
                     MAKE because it is more compatible with other versions of
                     bbmmaakkee and cannot be confused with the special target with
                     the same name.

     _._M_A_K_E_._D_E_P_E_N_D_F_I_L_E
                     Names the makefile (default `_._d_e_p_e_n_d') from which
                     generated dependencies are read.

     _._M_A_K_E_._E_X_P_O_R_T_E_D  The list of variables exported by bbmmaakkee.

     _._M_A_K_E_._J_O_B_S      The argument to the --jj option.

     _._M_A_K_E_._J_O_B_._P_R_E_F_I_X
                     If bbmmaakkee is run with _j then output for each target is
                     prefixed with a token `--- target ---' the first part of
                     which can be controlled via _._M_A_K_E_._J_O_B_._P_R_E_F_I_X.
                     For example:
                     .MAKE.JOB.PREFIX=${.newline}---${.MAKE:T}[${.MAKE.PID}]
                     would produce tokens like `---make[1234] target ---'
                     making it easier to track the degree of parallelism being
                     achieved.

     MAKEFLAGS       The environment variable `MAKEFLAGS' may contain anything
                     that may be specified on bbmmaakkee's command line.  Anything
                     specified on bbmmaakkee's command line is appended to the
                     `MAKEFLAGS' variable which is then entered into the
                     environment for all programs which bbmmaakkee executes.

     _._M_A_K_E_._L_E_V_E_L     The recursion depth of bbmmaakkee.  The initial instance of
                     bbmmaakkee will be 0, and an incremented value is put into the
                     environment to be seen by the next generation.  This
                     allows tests like: .if ${.MAKE.LEVEL} == 0 to protect
                     things which should only be evaluated in the initial
                     instance of bbmmaakkee.

     _._M_A_K_E_._M_A_K_E_F_I_L_E___P_R_E_F_E_R_E_N_C_E
                     The ordered list of makefile names (default `_m_a_k_e_f_i_l_e',
                     `_M_a_k_e_f_i_l_e') that bbmmaakkee will look for.

     _._M_A_K_E_._M_A_K_E_F_I_L_E_S
                     The list of makefiles read by bbmmaakkee, which is useful for
                     tracking dependencies.  Each makefile is recorded only
                     once, regardless of the number of times read.

     _._M_A_K_E_._M_O_D_E      Processed after reading all makefiles.  Can affect the
                     mode that bbmmaakkee runs in.  Currently just `_c_o_m_p_a_t' mode.

     _._M_A_K_E_O_V_E_R_R_I_D_E_S  This variable is used to record the names of variables
                     assigned to on the command line, so that they may be
                     exported as part of `MAKEFLAGS'.  This behaviour can be
                     disabled by assigning an empty value to `_._M_A_K_E_O_V_E_R_R_I_D_E_S'
                     within a makefile.  Extra variables can be exported from
                     a makefile by appending their names to `_._M_A_K_E_O_V_E_R_R_I_D_E_S'.
                     `MAKEFLAGS' is re-exported whenever `_._M_A_K_E_O_V_E_R_R_I_D_E_S' is
                     modified.

     _._M_A_K_E_._P_I_D       The process-id of bbmmaakkee.

     _._M_A_K_E_._P_P_I_D      The parent process-id of bbmmaakkee.

     _M_A_K_E___P_R_I_N_T___V_A_R___O_N___E_R_R_O_R
                     When bbmmaakkee stops due to an error, it prints its name and
                     the value of `_._C_U_R_D_I_R' as well as the value of any
                     variables named in `_M_A_K_E___P_R_I_N_T___V_A_R___O_N___E_R_R_O_R'.

     _._n_e_w_l_i_n_e        This variable is simply assigned a newline character as
                     its value.  This allows expansions using the ::@@ modifier
                     to put a newline between iterations of the loop rather
                     than a space.  For example, the printing of
                     `_M_A_K_E___P_R_I_N_T___V_A_R___O_N___E_R_R_O_R' could be done as
                     ${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'${.newline}@}.

     _._O_B_J_D_I_R         A path to the directory where the targets are built.  Its
                     value is determined by trying to chdir(2) to the
                     following directories in order and using the first match:

                     1.   ${MAKEOBJDIRPREFIX}${.CURDIR}

                          (Only if `MAKEOBJDIRPREFIX' is set in the
                          environment or on the command line.)

                     2.   ${MAKEOBJDIR}

                          (Only if `MAKEOBJDIR' is set in the environment or
                          on the command line.)

                     3.   ${.CURDIR}_/_o_b_j_.${MACHINE}

                     4.   ${.CURDIR}_/_o_b_j

                     5.   _/_u_s_r_/_o_b_j_/${.CURDIR}

                     6.   ${.CURDIR}

                     Variable expansion is performed on the value before it's
                     used, so expressions such as
                           ${.CURDIR:S,^/usr/src,/var/obj,}
                     may be used.  This is especially useful with
                     `MAKEOBJDIR'.

                     `_._O_B_J_D_I_R' may be modified in the makefile as a global
                     variable.  In all cases, bbmmaakkee will chdir(2) to `_._O_B_J_D_I_R'
                     and set `PWD' to that directory before executing any
                     targets.

     _._P_A_R_S_E_D_I_R       A path to the directory of the current `_M_a_k_e_f_i_l_e' being
                     parsed.

     _._P_A_R_S_E_F_I_L_E      The basename of the current `_M_a_k_e_f_i_l_e' being parsed.
                     This variable and `_._P_A_R_S_E_D_I_R' are both set only while the
                     `_M_a_k_e_f_i_l_e_s' are being parsed.

     _._P_A_T_H           A variable that represents the list of directories that
                     bbmmaakkee will search for files.  The search list should be
                     updated using the target `_._P_A_T_H' rather than the
                     variable.

     PWD             Alternate path to the current directory.  bbmmaakkee normally
                     sets `_._C_U_R_D_I_R' to the canonical path given by getcwd(3).
                     However, if the environment variable `PWD' is set and
                     gives a path to the current directory, then bbmmaakkee sets
                     `_._C_U_R_D_I_R' to the value of `PWD' instead.  This behaviour
                     is disabled if `MAKEOBJDIRPREFIX' is set or `MAKEOBJDIR'
                     contains a variable transform.  `PWD' is set to the value
                     of `_._O_B_J_D_I_R' for all programs which bbmmaakkee executes.

     .TARGETS        The list of targets explicitly specified on the command
                     line, if any.

     VPATH           Colon-separated (``:'') lists of directories that bbmmaakkee
                     will search for files.  The variable is supported for
                     compatibility with old make programs only, use `_._P_A_T_H'
                     instead.

   VVaarriiaabbllee mmooddiiffiieerrss
     Variable expansion may be modified to select or modify each word of the
     variable (where a ``word'' is white-space delimited sequence of
     characters).  The general format of a variable expansion is as follows:

           ${variable[:modifier[:...]]}

     Each modifier begins with a colon, which may be escaped with a backslash
     (`\').

     A set of modifiers can be specified via a variable, as follows:

           modifier_variable=modifier[:...]
           ${variable:${modifier_variable}[:...]}

     In this case the first modifier in the modifier_variable does not start
     with a colon, since that must appear in the referencing variable.  If any
     of the modifiers in the modifier_variable contain a dollar sign (`$'),
     these must be doubled to avoid early expansion.

     The supported modifiers are:

     ::EE   Replaces each word in the variable with its suffix.

     ::HH   Replaces each word in the variable with everything but the last
          component.

     ::MM_p_a_t_t_e_r_n
          Select only those words that match _p_a_t_t_e_r_n.  The standard shell
          wildcard characters (`*', `?', and `[]') may be used.  The wildcard
          characters may be escaped with a backslash (`\').

     ::NN_p_a_t_t_e_r_n
          This is identical to `::MM', but selects all words which do not match
          _p_a_t_t_e_r_n.

     ::OO   Order every word in variable alphabetically.  To sort words in
          reverse order use the `::OO::[[--11....11]]' combination of modifiers.

     ::OOxx  Randomize words in variable.  The results will be different each
          time you are referring to the modified variable; use the assignment
          with expansion (`::==') to prevent such behaviour.  For example,

                LIST=                   uno due tre quattro
                RANDOM_LIST=            ${LIST:Ox}
                STATIC_RANDOM_LIST:=    ${LIST:Ox}

                all:
                        @echo "${RANDOM_LIST}"
                        @echo "${RANDOM_LIST}"
                        @echo "${STATIC_RANDOM_LIST}"
                        @echo "${STATIC_RANDOM_LIST}"
          may produce output similar to:

                quattro due tre uno
                tre due quattro uno
                due uno quattro tre
                due uno quattro tre

     ::QQ   Quotes every shell meta-character in the variable, so that it can be
          passed safely through recursive invocations of bbmmaakkee.

     ::RR   Replaces each word in the variable with everything but its suffix.

     ::ttAA  Attempt to convert variable to an absolute path using realpath(3),
          if that fails, the value is unchanged.

     ::ttll  Converts variable to lower-case letters.

     ::ttss_c
          Words in the variable are normally separated by a space on
          expansion.  This modifier sets the separator to the character _c.  If
          _c is omitted, then no separator is used.  The common escapes
          (including octal numeric codes), work as expected.

     ::ttuu  Converts variable to upper-case letters.

     ::ttWW  Causes the value to be treated as a single word (possibly containing
          embedded white space).  See also `::[[**]]'.

     ::ttww  Causes the value to be treated as a sequence of words delimited by
          white space.  See also `::[[@@]]'.

     ::SS/_o_l_d___s_t_r_i_n_g/_n_e_w___s_t_r_i_n_g/[11ggWW]
          Modify the first occurrence of _o_l_d___s_t_r_i_n_g in the variable's value,
          replacing it with _n_e_w___s_t_r_i_n_g.  If a `g' is appended to the last
          slash of the pattern, all occurrences in each word are replaced.  If
          a `1' is appended to the last slash of the pattern, only the first
          word is affected.  If a `W' is appended to the last slash of the
          pattern, then the value is treated as a single word (possibly
          containing embedded white space).  If _o_l_d___s_t_r_i_n_g begins with a caret
          (`^'), _o_l_d___s_t_r_i_n_g is anchored at the beginning of each word.  If
          _o_l_d___s_t_r_i_n_g ends with a dollar sign (`$'), it is anchored at the end
          of each word.  Inside _n_e_w___s_t_r_i_n_g, an ampersand (`&') is replaced by
          _o_l_d___s_t_r_i_n_g (without any `^' or `$').  Any character may be used as a
          delimiter for the parts of the modifier string.  The anchoring,
          ampersand and delimiter characters may be escaped with a backslash
          (`\').

          Variable expansion occurs in the normal fashion inside both
          _o_l_d___s_t_r_i_n_g and _n_e_w___s_t_r_i_n_g with the single exception that a backslash
          is used to prevent the expansion of a dollar sign (`$'), not a
          preceding dollar sign as is usual.

     ::CC/_p_a_t_t_e_r_n/_r_e_p_l_a_c_e_m_e_n_t/[11ggWW]
          The ::CC modifier is just like the ::SS modifier except that the old and
          new strings, instead of being simple strings, are a regular
          expression (see regex(3)) string _p_a_t_t_e_r_n and an ed(1)-style string
          _r_e_p_l_a_c_e_m_e_n_t.  Normally, the first occurrence of the pattern _p_a_t_t_e_r_n
          in each word of the value is substituted with _r_e_p_l_a_c_e_m_e_n_t.  The `1'
          modifier causes the substitution to apply to at most one word; the
          `g' modifier causes the substitution to apply to as many instances
          of the search pattern _p_a_t_t_e_r_n as occur in the word or words it is
          found in; the `W' modifier causes the value to be treated as a
          single word (possibly containing embedded white space).  Note that
          `1' and `g' are orthogonal; the former specifies whether multiple
          words are potentially affected, the latter whether multiple
          substitutions can potentially occur within each affected word.

     ::TT   Replaces each word in the variable with its last component.

     ::uu   Remove adjacent duplicate words (like uniq(1)).

     ::??_t_r_u_e___s_t_r_i_n_g::_f_a_l_s_e___s_t_r_i_n_g
          If the variable name (not its value), when parsed as a .if
          conditional expression, evaluates to true, return as its value the
          _t_r_u_e___s_t_r_i_n_g, otherwise return the _f_a_l_s_e___s_t_r_i_n_g.  Since the variable
          name is used as the expression, :? must be the first modifier after
          the variable name itself - which will, of course, usually contain
          variable expansions.  A common error is trying to use expressions
          like
                ${NUMBERS:M42:?match:no}
          which actually tests defined(NUMBERS), to determine is any words
          match "42" you need to use something like:
                ${${NUMBERS:M42} !=  :?match:no}.

     _:_o_l_d___s_t_r_i_n_g_=_n_e_w___s_t_r_i_n_g
          This is the AT&T System V UNIX style variable substitution.  It must
          be the last modifier specified.  If _o_l_d___s_t_r_i_n_g or _n_e_w___s_t_r_i_n_g do not
          contain the pattern matching character _% then it is assumed that
          they are anchored at the end of each word, so only suffixes or
          entire words may be replaced.  Otherwise _% is the substring of
          _o_l_d___s_t_r_i_n_g to be replaced in _n_e_w___s_t_r_i_n_g.

          Variable expansion occurs in the normal fashion inside both
          _o_l_d___s_t_r_i_n_g and _n_e_w___s_t_r_i_n_g with the single exception that a backslash
          is used to prevent the expansion of a dollar sign (`$'), not a
          preceding dollar sign as is usual.

     ::@@_t_e_m_p@@_s_t_r_i_n_g@@
          This is the loop expansion mechanism from the OSF Development
          Environment (ODE) make.  Unlike ..ffoorr loops expansion occurs at the
          time of reference.  Assign _t_e_m_p to each word in the variable and
          evaluate _s_t_r_i_n_g.  The ODE convention is that _t_e_m_p should start and
          end with a period.  For example.
                ${LINKS:@.LINK.@${LN} ${TARGET} ${.LINK.}@}

     ::UU_n_e_w_v_a_l
          If the variable is undefined _n_e_w_v_a_l is the value.  If the variable
          is defined, the existing value is returned.  This is another ODE
          make feature.  It is handy for setting per-target CFLAGS for
          instance:
                ${_${.TARGET:T}_CFLAGS:U${DEF_CFLAGS}}
          If a value is only required if the variable is undefined, use:
                ${VAR:D:Unewval}

     ::DD_n_e_w_v_a_l
          If the variable is defined _n_e_w_v_a_l is the value.

     ::LL   The name of the variable is the value.

     ::PP   The path of the node which has the same name as the variable is the
          value.  If no such node exists or its path is null, then the name of
          the variable is used.

     ::!!_c_m_d!!
          The output of running _c_m_d is the value.

     ::sshh  If the variable is non-empty it is run as a command and the output
          becomes the new value.

     ::::==_s_t_r
          The variable is assigned the value _s_t_r after substitution.  This
          modifier and its variations are useful in obscure situations such as
          wanting to set a variable when shell commands are being parsed.
          These assignment modifiers always expand to nothing, so if appearing
          in a rule line by themselves should be preceded with something to
          keep bbmmaakkee happy.

          The `::::' helps avoid false matches with the AT&T System V UNIX style
          ::== modifier and since substitution always occurs the ::::== form is
          vaguely appropriate.

     ::::??==_s_t_r
          As for ::::== but only if the variable does not already have a value.

     ::::++==_s_t_r
          Append _s_t_r to the variable.

     ::::!!==_c_m_d
          Assign the output of _c_m_d to the variable.

     ::[[_r_a_n_g_e]]
          Selects one or more words from the value, or performs other
          operations related to the way in which the value is divided into
          words.

          Ordinarily, a value is treated as a sequence of words delimited by
          white space.  Some modifiers suppress this behaviour, causing a
          value to be treated as a single word (possibly containing embedded
          white space).  An empty value, or a value that consists entirely of
          white-space, is treated as a single word.  For the purposes of the
          `::[[]]' modifier, the words are indexed both forwards using positive
          integers (where index 1 represents the first word), and backwards
          using negative integers (where index -1 represents the last word).

          The _r_a_n_g_e is subjected to variable expansion, and the expanded
          result is then interpreted as follows:

          _i_n_d_e_x  Selects a single word from the value.

          _s_t_a_r_t...._e_n_d
                 Selects all words from _s_t_a_r_t to _e_n_d, inclusive.  For example,
                 `::[[22....--11]]' selects all words from the second word to the last
                 word.  If _s_t_a_r_t is greater than _e_n_d, then the words are
                 output in reverse order.  For example, `::[[--11....11]]' selects all
                 the words from last to first.

          **      Causes subsequent modifiers to treat the value as a single
                 word (possibly containing embedded white space).  Analogous
                 to the effect of "$*" in Bourne shell.

          0      Means the same as `::[[**]]'.

          @@      Causes subsequent modifiers to treat the value as a sequence
                 of words delimited by white space.  Analogous to the effect
                 of "$@" in Bourne shell.

          ##      Returns the number of words in the value.

IINNCCLLUUDDEE SSTTAATTEEMMEENNTTSS,, CCOONNDDIITTIIOONNAALLSS AANNDD FFOORR LLOOOOPPSS
     Makefile inclusion, conditional structures and for loops  reminiscent of
     the C programming language are provided in bbmmaakkee.  All such structures
     are identified by a line beginning with a single dot (`.') character.
     Files are included with either ..iinncclluuddee <_f_i_l_e> or ..iinncclluuddee "_f_i_l_e".
     Variables between the angle brackets or double quotes are expanded to
     form the file name.  If angle brackets are used, the included makefile is
     expected to be in the system makefile directory.  If double quotes are
     used, the including makefile's directory and any directories specified
     using the --II option are searched before the system makefile directory.
     For compatibility with other versions of bbmmaakkee `include file ...' is also
     accepted.  If the include statement is written as ..--iinncclluuddee or as
     ..ssiinncclluuddee then errors locating and/or opening include files are ignored.

     Conditional expressions are also preceded by a single dot as the first
     character of a line.  The possible conditionals are as follows:

     ..eerrrroorr _m_e_s_s_a_g_e
             The message is printed along with the name of the makefile and
             line number, then bbmmaakkee will exit.

     ..eexxppoorrtt _v_a_r_i_a_b_l_e _._._.
             Export the specified global variable.  If no variable list is
             provided, all globals are exported except for internal variables
             (those that start with `.').  This is not affected by the --XX
             flag, so should be used with caution.

             Appending a variable name to _._M_A_K_E_._E_X_P_O_R_T_E_D is equivalent to
             exporting a variable.

     ..eexxppoorrtt--eennvv _v_a_r_i_a_b_l_e _._._.
             The same as `.export', except that the variable is not appended
             to _._M_A_K_E_._E_X_P_O_R_T_E_D.  This allows exporting a value to the
             environment which is different from that used by bbmmaakkee
             internally.

     ..iinnffoo _m_e_s_s_a_g_e
             The message is printed along with the name of the makefile and
             line number.

     ..uunnddeeff _v_a_r_i_a_b_l_e
             Un-define the specified global variable.  Only global variables
             may be un-defined.

     ..uunneexxppoorrtt _v_a_r_i_a_b_l_e _._._.
             The opposite of `.export'.  The specified global _v_a_r_i_a_b_l_e will be
             removed from _._M_A_K_E_._E_X_P_O_R_T_E_D.  If no variable list is provided,
             all globals are unexported, and _._M_A_K_E_._E_X_P_O_R_T_E_D deleted.

     ..uunneexxppoorrtt--eennvv
             Unexport all globals previously exported and clear the
             environment inherited from the parent.  This operation will cause
             a memory leak of the original environment, so should be used
             sparingly.  Testing for _._M_A_K_E_._L_E_V_E_L being 0, would make sense.
             Also note that any variables which originated in the parent
             environment should be explicitly preserved if desired.  For
             example:

                   .if ${.MAKE.LEVEL} == 0
                   PATH := ${PATH}
                   .unexport-env
                   .export PATH
                   .endif

             Would result in an environment containing only `PATH', which is
             the minimal useful environment.  Actually `.MAKE.LEVEL' will also
             be pushed into the new environment.

     ..wwaarrnniinngg _m_e_s_s_a_g_e
             The message prefixed by `_w_a_r_n_i_n_g_:' is printed along with the name
             of the makefile and line number.

     ..iiff [!]_e_x_p_r_e_s_s_i_o_n [_o_p_e_r_a_t_o_r _e_x_p_r_e_s_s_i_o_n _._._.]
             Test the value of an expression.

     ..iiffddeeff [!]_v_a_r_i_a_b_l_e [_o_p_e_r_a_t_o_r _v_a_r_i_a_b_l_e _._._.]
             Test the value of a variable.

     ..iiffnnddeeff [!]_v_a_r_i_a_b_l_e [_o_p_e_r_a_t_o_r _v_a_r_i_a_b_l_e _._._.]
             Test the value of a variable.

     ..iiffmmaakkee [!]_t_a_r_g_e_t [_o_p_e_r_a_t_o_r _t_a_r_g_e_t _._._.]
             Test the target being built.

     ..iiffnnmmaakkee [!] _t_a_r_g_e_t [_o_p_e_r_a_t_o_r _t_a_r_g_e_t _._._.]
             Test the target being built.

     ..eellssee   Reverse the sense of the last conditional.

     ..eelliiff [!] _e_x_p_r_e_s_s_i_o_n [_o_p_e_r_a_t_o_r _e_x_p_r_e_s_s_i_o_n _._._.]
             A combination of `..eellssee' followed by `..iiff'.

     ..eelliiffddeeff [!]_v_a_r_i_a_b_l_e [_o_p_e_r_a_t_o_r _v_a_r_i_a_b_l_e _._._.]
             A combination of `..eellssee' followed by `..iiffddeeff'.

     ..eelliiffnnddeeff [!]_v_a_r_i_a_b_l_e [_o_p_e_r_a_t_o_r _v_a_r_i_a_b_l_e _._._.]
             A combination of `..eellssee' followed by `..iiffnnddeeff'.

     ..eelliiffmmaakkee [!]_t_a_r_g_e_t [_o_p_e_r_a_t_o_r _t_a_r_g_e_t _._._.]
             A combination of `..eellssee' followed by `..iiffmmaakkee'.

     ..eelliiffnnmmaakkee [!]_t_a_r_g_e_t [_o_p_e_r_a_t_o_r _t_a_r_g_e_t _._._.]
             A combination of `..eellssee' followed by `..iiffnnmmaakkee'.

     ..eennddiiff  End the body of the conditional.

     The _o_p_e_r_a_t_o_r may be any one of the following:

     ||||     Logical OR.

     &&&&     Logical AND; of higher precedence than ``||''.

     As in C, bbmmaakkee will only evaluate a conditional as far as is necessary to
     determine its value.  Parentheses may be used to change the order of
     evaluation.  The boolean operator `!!' may be used to logically negate an
     entire conditional.  It is of higher precedence than `&&&&'.

     The value of _e_x_p_r_e_s_s_i_o_n may be any of the following:

     ddeeffiinneedd  Takes a variable name as an argument and evaluates to true if
              the variable has been defined.

     mmaakkee     Takes a target name as an argument and evaluates to true if the
              target was specified as part of bbmmaakkee's command line or was
              declared the default target (either implicitly or explicitly,
              see _._M_A_I_N) before the line containing the conditional.

     eemmppttyy    Takes a variable, with possible modifiers, and evaluates to true
              if the expansion of the variable would result in an empty
              string.

     eexxiissttss   Takes a file name as an argument and evaluates to true if the
              file exists.  The file is searched for on the system search path
              (see _._P_A_T_H).

     ttaarrggeett   Takes a target name as an argument and evaluates to true if the
              target has been defined.

     ccoommmmaannddss
              Takes a target name as an argument and evaluates to true if the
              target has been defined and has commands associated with it.

     _E_x_p_r_e_s_s_i_o_n may also be an arithmetic or string comparison.  Variable
     expansion is performed on both sides of the comparison, after which the
     integral values are compared.  A value is interpreted as hexadecimal if
     it is preceded by 0x, otherwise it is decimal; octal numbers are not
     supported.  The standard C relational operators are all supported.  If
     after variable expansion, either the left or right hand side of a `====' or
     `!!==' operator is not an integral value, then string comparison is
     performed between the expanded variables.  If no relational operator is
     given, it is assumed that the expanded variable is being compared against
     0 or an empty string in the case of a string comparison.

     When bbmmaakkee is evaluating one of these conditional expressions, and it
     encounters a (white-space separated) word it doesn't recognize, either
     the ``make'' or ``defined'' expression is applied to it, depending on the
     form of the conditional.  If the form is `..iiffddeeff', `..iiffnnddeeff', or `..iiff'
     the ``defined'' expression is applied.  Similarly, if the form is
     `..iiffmmaakkee' or `..iiffnnmmaakkee, tthhee' ``make'' expression is applied.

     If the conditional evaluates to true the parsing of the makefile
     continues as before.  If it evaluates to false, the following lines are
     skipped.  In both cases this continues until a `..eellssee' or `..eennddiiff' is
     found.

     For loops are typically used to apply a set of rules to a list of files.
     The syntax of a for loop is:

     ..ffoorr _v_a_r_i_a_b_l_e [_v_a_r_i_a_b_l_e _._._.] iinn _e_x_p_r_e_s_s_i_o_n
     <make-rules>
     ..eennddffoorr

     After the for eexxpprreessssiioonn is evaluated, it is split into words.  On each
     iteration of the loop, one word is taken and assigned to each vvaarriiaabbllee,
     in order, and these vvaarriiaabblleess are substituted into the mmaakkee--rruulleess inside
     the body of the for loop.  The number of words must come out even; that
     is, if there are three iteration variables, the number of words provided
     must be a multiple of three.

CCOOMMMMEENNTTSS
     Comments begin with a hash (`#') character, anywhere but in a shell
     command line, and continue to the end of an unescaped new line.

SSPPEECCIIAALL SSOOUURRCCEESS ((AATTTTRRIIBBUUTTEESS))
     ..EEXXEECC     Target is never out of date, but always execute commands
               anyway.

     ..IIGGNNOORREE   Ignore any errors from the commands associated with this
               target, exactly as if they all were preceded by a dash (`-').

     ..MMAADDEE     Mark all sources of this target as being up-to-date.

     ..MMAAKKEE     Execute the commands associated with this target even if the --nn
               or --tt options were specified.  Normally used to mark recursive
               bbmmaakkee's.

     ..NNOOPPAATTHH   Do not search for the target in the directories specified by
               ..PPAATTHH.

     ..NNOOTTMMAAIINN  Normally bbmmaakkee selects the first target it encounters as the
               default target to be built if no target was specified.  This
               source prevents this target from being selected.

     ..OOPPTTIIOONNAALL
               If a target is marked with this attribute and bbmmaakkee can't
               figure out how to create it, it will ignore this fact and
               assume the file isn't needed or already exists.

     ..PPHHOONNYY    The target does not correspond to an actual file; it is always
               considered to be out of date, and will not be created with the
               --tt option.  Suffix-transformation rules are not applied to
               ..PPHHOONNYY targets.

     ..PPRREECCIIOOUUSS
               When bbmmaakkee is interrupted, it normally removes any partially
               made targets.  This source prevents the target from being
               removed.

     ..RREECCUURRSSIIVVEE
               Synonym for ..MMAAKKEE.

     ..SSIILLEENNTT   Do not echo any of the commands associated with this target,
               exactly as if they all were preceded by an at sign (`@').

     ..UUSSEE      Turn the target into bbmmaakkee's version of a macro.  When the
               target is used as a source for another target, the other target
               acquires the commands, sources, and attributes (except for
               ..UUSSEE) of the source.  If the target already has commands, the
               ..UUSSEE target's commands are appended to them.

     ..UUSSEEBBEEFFOORREE
               Exactly like ..UUSSEE, but prepend the ..UUSSEEBBEEFFOORREE target commands
               to the target.

     ..WWAAIITT     If ..WWAAIITT appears in a dependency line, the sources that precede
               it are made before the sources that succeed it in the line.
               Since the dependents of files are not made until the file
               itself could be made, this also stops the dependents being
               built unless they are needed for another branch of the
               dependency tree.  So given:

               x: a .WAIT b
                       echo x
               a:
                       echo a
               b: b1
                       echo b
               b1:
                       echo b1

               the output is always `a', `b1', `b', `x'.
               The ordering imposed by ..WWAAIITT is only relevant for parallel
               makes.

SSPPEECCIIAALL TTAARRGGEETTSS
     Special targets may not be included with other targets, i.e. they must be
     the only target specified.

     ..BBEEGGIINN   Any command lines attached to this target are executed before
              anything else is done.

     ..DDEEFFAAUULLTT
              This is sort of a ..UUSSEE rule for any target (that was used only
              as a source) that bbmmaakkee can't figure out any other way to
              create.  Only the shell script is used.  The ..IIMMPPSSRRCC variable of
              a target that inherits ..DDEEFFAAUULLTT's commands is set to the
              target's own name.

     ..EENNDD     Any command lines attached to this target are executed after
              everything else is done.

     ..EERRRROORR   Any command lines attached to this target are executed when
              another target fails.  The ..EERRRROORR__TTAARRGGEETT variable is set to the
              target that failed.  See also MMAAKKEE__PPRRIINNTT__VVAARR__OONN__EERRRROORR.

     ..IIGGNNOORREE  Mark each of the sources with the ..IIGGNNOORREE attribute.  If no
              sources are specified, this is the equivalent of specifying the
              --ii option.

     ..IINNTTEERRRRUUPPTT
              If bbmmaakkee is interrupted, the commands for this target will be
              executed.

     ..MMAAIINN    If no target is specified when bbmmaakkee is invoked, this target
              will be built.

     ..MMAAKKEEFFLLAAGGSS
              This target provides a way to specify flags for bbmmaakkee when the
              makefile is used.  The flags are as if typed to the shell,
              though the --ff option will have no effect.

     ..NNOOPPAATTHH  Apply the ..NNOOPPAATTHH attribute to any specified sources.

     ..NNOOTTPPAARRAALLLLEELL
              Disable parallel mode.

     ..NNOO__PPAARRAALLLLEELL
              Synonym for ..NNOOTTPPAARRAALLLLEELL, for compatibility with other pmake
              variants.

     ..OORRDDEERR   The named targets are made in sequence.  This ordering does not
              add targets to the list of targets to be made.  Since the
              dependents of a target do not get built until the target itself
              could be built, unless `a' is built by another part of the
              dependency graph, the following is a dependency loop:

              .ORDER: a b
              b: a

              The ordering imposed by ..OORRDDEERR is only relevant for parallel
              makes.

     ..PPAATTHH    The sources are directories which are to be searched for files
              not found in the current directory.  If no sources are
              specified, any previously specified directories are deleted.  If
              the source is the special ..DDOOTTLLAASSTT target, then the current
              working directory is searched last.

     ..PPHHOONNYY   Apply the ..PPHHOONNYY attribute to any specified sources.

     ..PPRREECCIIOOUUSS
              Apply the ..PPRREECCIIOOUUSS attribute to any specified sources.  If no
              sources are specified, the ..PPRREECCIIOOUUSS attribute is applied to
              every target in the file.

     ..SSHHEELLLL   Sets the shell that bbmmaakkee will use to execute commands.  The
              sources are a set of _f_i_e_l_d_=_v_a_l_u_e pairs.

              _n_a_m_e        This is the minimal specification, used to select
                          one of the builtin shell specs; _s_h, _k_s_h, and _c_s_h.

              _p_a_t_h        Specifies the path to the shell.

              _h_a_s_E_r_r_C_t_l   Indicates whether the shell supports exit on error.

              _c_h_e_c_k       The command to turn on error checking.

              _i_g_n_o_r_e      The command to disable error checking.

              _e_c_h_o        The command to turn on echoing of commands executed.

              _q_u_i_e_t       The command to turn off echoing of commands
                          executed.

              _f_i_l_t_e_r      The output to filter after issuing the _q_u_i_e_t
                          command.  It is typically identical to _q_u_i_e_t.

              _e_r_r_F_l_a_g     The flag to pass the shell to enable error checking.

              _e_c_h_o_F_l_a_g    The flag to pass the shell to enable command
                          echoing.

              _n_e_w_l_i_n_e     The string literal to pass the shell that results in
                          a single newline character when used outside of any
                          quoting characters.
              Example:

              .SHELL: name=ksh path=/bin/ksh hasErrCtl=true \
                      check="set -e" ignore="set +e" \
                      echo="set -v" quiet="set +v" filter="set +v" \
                      echoFlag=v errFlag=e newline="'\n'"

     ..SSIILLEENNTT  Apply the ..SSIILLEENNTT attribute to any specified sources.  If no
              sources are specified, the ..SSIILLEENNTT attribute is applied to every
              command in the file.

     ..SSUUFFFFIIXXEESS
              Each source specifies a suffix to bbmmaakkee.  If no sources are
              specified, any previously specified suffixes are deleted.  It
              allows the creation of suffix-transformation rules.

              Example:

              .SUFFIXES: .o
              .c.o:
                      cc -o ${.TARGET} -c ${.IMPSRC}

EENNVVIIRROONNMMEENNTT
     bbmmaakkee uses the following environment variables, if they exist: MACHINE,
     MACHINE_ARCH, MAKE, MAKEFLAGS, MAKEOBJDIR, MAKEOBJDIRPREFIX, MAKESYSPATH,
     PWD, and TMPDIR.

     MAKEOBJDIRPREFIX and MAKEOBJDIR may only be set in the environment or on
     the command line to bbmmaakkee and not as makefile variables; see the
     description of `_._O_B_J_D_I_R' for more details.

FFIILLEESS
     .depend        list of dependencies
     Makefile       list of dependencies
     makefile       list of dependencies
     sys.mk         system makefile
     /usr/share/mk  system makefile directory

CCOOMMPPAATTIIBBIILLIITTYY
     The basic make syntax is compatible between different versions of make,
     however the special variables, variable modifiers and conditionals are
     not.

     The way that parallel makes are scheduled changed in NetBSD 4.0 so that
     .ORDER and .WAIT apply recursively to the dependant nodes.  The
     algorithms used may change again in the future.

     The way that .for loop variables are substituted changed after NetBSD 5.0
     so that they still appear to be variable expansions.  In particular this
     stops them being treated as syntax, and removes some obscure problems
     using them in .if statements.

SSEEEE AALLSSOO
     mkdep(1)

HHIISSTTOORRYY
     A bbmmaakkee command appeared in Version 7 AT&T UNIX.  bbmmaakkee is derived from
     NetBSD's make(1).  It uses autoconf to facilitate portability to other
     platforms.

BBUUGGSS
     The bbmmaakkee syntax is difficult to parse without actually acting of the
     data.  For instance finding the end of a variable use should involve
     scanning each the modifiers using the correct terminator for each field.
     In many places bbmmaakkee just counts {} and () in order to find the end of a
     variable expansion.

     There is no way of escaping a space character in a filename.

NetBSD 5.0                       June 30, 2010                      NetBSD 5.0