media-sound/mup-5.4 fails to build because it tries to link to fltk. fltk isn't in the default linking path, it is in /usr/$(get_libdir)/libfltk-1.1/libfltk.so. So mup's buildsystem appends -L/usr/lib/libfltk-1.1 to its LDFLAGS. My arch is amd64, so all of my libs are in /usr/lib64 and /lib64. I am refusing to symlink my /lib to /lib64 and /usr/lib to /usr/lib64 ;-). (and other bugs like this one have been accepted: bug 259780, bug 209679).
Fixed. Thanks for reporting. + 05 May 2010; Thomas Beierlein <tomjbe@gentoo.org> mup-5.4.ebuild: + Use /usr/$(get_libdir) instead hardcoded /usr/lib; Resolves Bug #281424. +