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AM_CONDITIONAL `configure' should output the `Makefile' for each directory and define a condition into which `opt/' should be built.
... AM_CONDITIONAL([COND_OPT], [test "$want_opt" = yes]) AC_CONFIG_FILES([Makefile src/Makefile opt/Makefile]) ... |
Then SUBDIRS can be defined in the top-level `Makefile.am'
as follows.
if COND_OPT MAYBE_OPT = opt endif SUBDIRS = src $(MAYBE_OPT) |
As you can see, running make will rightly recurse into
`src/' and maybe `opt/'.
As you can't see, running make dist will recurse into both
`src/' and `opt/' directories because make dist, unlike
make all, doesn't use the SUBDIRS variable. It uses the
DIST_SUBDIRS variable.
In this case Automake will define DIST_SUBDIRS = src opt
automatically because it knows that MAYBE_OPT can contain
opt in some condition.