yuck

A command line option parser generator for C that works with
only household ingredients (a C compiler and the m4 macro
processor) and supports:
+ GNU-style long options (--blah)
+ condensable short options (-xab for -x -a -b)
+ optional arguments to long and short options (--foo[=BAR])
+ multiple occurrence of options (-vvv)
+ does not depend on libc's getopt() nor getopt_long()