looked at configure.ac and Makefile.am and CMakeLists.txt, didn't see any conditional adding of export/ExportMP3.cpp.
Same error here. With ">=media-sound/audacity-2.2.2 -lame" got lame/lame.h: No such file or directory. With ">=media-sound/audacity-2.2.2 lame" build fine.
Same problem here. It seems audacity can't be built without lame.
https://github.com/audacity/audacity/pull/375
USE=-lame builds fine here.
(In reply to CaptainBlood from comment #4) > USE=-lame builds fine here. It builds fine if media-sound/lame is installed.
i suppose this one has already been fixed. if not, please report back.