How about something like this? To alert the user that CFLAG_VISIBILITY needs to be manually added at some places.
/Simon diff --git a/modules/lib-symbol-visibility b/modules/lib-symbol-visibility index a30249c..fc8984d 100644 --- a/modules/lib-symbol-visibility +++ b/modules/lib-symbol-visibility @@ -1,6 +1,10 @@ Description: Control of symbols exported by shared libraries. +Notice: +The value of $(CFLAG_VISIBILITY) needs to be added to the CFLAGS for the +compilation of all sources that make up the library. + Files: m4/visibility.m4
