I'm running into the weirdest thing. Yesterday I separated out some of the common makefile macros and put them into common.mk. This works without a problem on mingw, however, when I try to build -corebase on openSUSE ADDTIONAL_INCLUDE_DIRS doesn't come across. All other macros do, though. If I explicitly set it in GNUmakefile it works, if I use the one provided by common.mk it doesn't.