Without this, compiling the tarball fails with
make: *** No rule to make target `objects/ao_write.cmdline.o', needed by `para_write'. Stop.
man_dir := man/man1
test_dir := t
-m4_ggos := afh audioc audiod client filter gui recv server write
+m4_ggos := afh audioc audiod client filter gui recv server write ao_write
all_ggos := $(m4_ggos) dccp_recv alsa_write oss_write fade http_recv \
osx_write udp_recv amp_filter compress_filter file_write \
mp3dec_filter prebuffer_filter