To Do
=====
add man page installation

Done
====
Do correct GNU Makefile-ish things
make a real mkdtemp thing
get rid of BINDIR
get rid of TAR_CMD
REMOVE_CMD -> RM
RMDIR_CMD -> RMDIR
use MKDIR for mkdir -p uses via vsystem. Use mkdir(2) for all other uses.
add digest files if MD5File not in -lc or -lmd
try it on Darwin
use full pathnames for utilities which are executed by vsystem()