Many packages have the ability to be built to support different sets of features. bsd.options.mk is a framework in pkgsrc that provides generic handling of those options that determine different ways in which the packages can be built. It's possible for the user to specify exactly which sets of options will be built into a package or to allow a set of global default options apply. Global default options are listed in PKG_DEFAULT_OPTIONS, which is a list of the options that should be built into every package if that option is supported. This variable should be set in /etc/mk.conf. The following example shows how bsd.options.mk should be use in a package Makefile, or in a file, e.g. options.mk, that is included by the main package Makefile. # Global and legacy options .if defined(WIBBLE_USE_OPENLDAP) && !empty(WIBBLE_USE_OPENLDAP:M[yY][eE][sS]) PKG_DEFAULT_OPTIONS+= ldap .endif .if defined(USE_SASL2) && !empty(USE_SASL2:M[yY][eE][sS]) PKG_DEFAULT_OPTIONS+= sasl .endif PKG_OPTIONS_VAR= PKG_OPTIONS.wibble PKG_SUPPORTED_OPTIONS= ldap sasl # # Default options for "wibble" package. # .if !defined(PKG_OPTIONS.wibble) PKG_DEFAULT_OPTIONS+= sasl endif .include "../../mk/bsd.options.mk" # Package-specific option-handling ### ### LDAP support ### .if !empty(PKG_OPTIONS:Mldap) . include "../../databases/openldap/buildlink3.mk" CONFIGURE_ARGS+= --enable-ldap=${BUILDLINK_PREFIX.openldap} .endif ### ### SASL authentication ### .if !empty(PKG_OPTIONS:Msasl) . include "../../security/cyrus-sasl2/buildlink3.mk" CONFIGURE_ARGS+= --enable-sasl=${BUILDLINK_PREFIX.sasl} .endif The first section only exists if you are converting a package that had its own ad-hoc options handling to use bsd.options.mk. It converts global or legacy options variables into an equivalent PKG_OPTIONS.pkg value. These sections will be removed over time as the old options are in turn deprecated and removed. The second section contains the information about which build options are supported by the package, and any default options settings if needed. PKG_OPTIONS_VAR is a list of the name of the &man.make.1; variables that contain the options the user wishes to select. The recommended value is PKG_OPTIONS.pkg but any package-specific value may be used. This variable should be set in a package Makefile. PKG_SUPPORTED_OPTIONS is a list of build options supported by the package. This variable should be set in a package Makefile. ${PKG_OPTIONS_VAR} (the variables named in PKG_OPTIONS_VAR) are variables that list the selected build options and override any default options given in PKG_DEFAULT_OPTIONS. If any of the options begin with a -, then that option is always removed from the selected build options, e.g. PKG_DEFAULT_OPTIONS= kerberos ldap sasl PKG_OPTIONS_VAR= WIBBLE_OPTIONS WIBBLE_OPTIONS= ${PKG_DEFAULT_OPTIONS} -sasl # implies PKG_OPTIONS == "kerberos ldap" or PKG_OPTIONS_VAR= WIBBLE_OPTIONS WIBBLE_OPTIONS= kerberos -ldap ldap # implies PKG_OPTIONS == "kerberos" This variable should be set in /etc/mk.conf. After the inclusion of bsd.options.mk, the following variables are set: PKG_OPTIONS contains the list of the selected build options, properly filtered to remove unsupported and duplicate options. The remaining sections contain the logic that is specific to each option. There should be a check for every option listed in PKG_SUPPORTED_OPTIONS, and there should be clear documentation on what turning on the option will do in the comments preceding each section. The correct way to check for an option is to check whether it is listed in PKG_OPTIONS.