Both allegro slots fail with libpng 1.5: [ 76%] Building C object addons/image/CMakeFiles/allegro_image.dir/tga.c.o [ 77%] Building C object addons/image/CMakeFiles/allegro_image.dir/png.c.o /var/tmp/portage/media-libs/allegro-5.0.3/work/allegro-5.0.3/addons/image/png.c:18:33: error: 'Z_BEST_COMPRESSION' undeclared here (not in a function) make[2]: *** [addons/image/CMakeFiles/allegro_image.dir/png.c.o] Error 1
fixed in 4.4.2 and 5.0.4