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6.2.2 Conditional subdirectories with AC_SUBST

Another idea is to define MAYBE_OPT from `./configure' using AC_SUBST:

 
...
if test "$want_opt" = yes; then
  MAYBE_OPT=opt
else
  MAYBE_OPT=
fi
AC_SUBST([MAYBE_OPT])
AC_CONFIG_FILES([Makefile src/Makefile opt/Makefile])
...

In this case the top-level `Makefile.am' should look as follows.

 
SUBDIRS = src $(MAYBE_OPT)
DIST_SUBDIRS = src opt

The drawback is that since Automake cannot guess what the possible values of MAYBE_OPT are, it is necessary to define DIST_SUBDIRS.


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