Uhm... on AMD64 the ebuild fails to compile with this error:
x86_64-pc-linux-gnu-gcc -o examp/dumbtest -Iinclude -Iinclude/allegrogl
-Iinclude/allegrogl/GLext -I/usr/include -O2 -Wall -ffast-math
-fomit-frame-pointer -L/usr/lib64 -Llib/unix examp/dumbtest.c -lagl
`/usr/bin/allegro-config --libs` -lGLU -lGL -lGL -ldl -lXxf86vm -lXext -lX11
-lm -lpthread
/var/tmp/portage/media-libs/allegrogl-0.4.1/temp/ccRhVd9x.o: In function
`main':
dumbtest.c:(.text+0x3b9): undefined reference to
`allegro_gl_set_video_bitmap_color_depth'
The error occurs with an example: maybe it would be wiser to hack the makefile
to skip the building of such files.