FYI, I solved this problem by letting gnulib put GNUmakefile and
maint.mk into build-aux/, and use this top-level GNUmakefile:
have-gnulib-files := $(shell test -f gnulib.mk && test -f maint.mk && echo yes)
ifneq ($(have-gnulib-files),yes)
gnulib.mk:
ln -s build-aux/GNUmakefile gnulib.mk || cp build-aux/GNUmakefile
gnulib.mk
ln -s build-aux/maint.mk maint.mk || cp build-aux/maint.mk maint.mk
endif
-include gnulib.mk
If this approach works out well, it should go into the manual, because
without it, the maintainer-makefile module seems useless for projects
that use AC_CONFIG_AUX_DIR.
/Simon
