Plan 9 from Bell Labs’s /usr/web/sources/contrib/fgb/root/sys/src/ape/X11/cmd/X/hw/xfree86/os-support/usl/Makefile.am
EXTRA_DIST = \ usl_init.c \ usl_iop.c \ usl_mouse.c \ usl_video.c \ usl_vtsw.c