[CC] res_musiconhold.c -> res_musiconhold.o
res_musiconhold.c: In function `spawn_mp3':
res_musiconhold.c:466: warning: implicit declaration of function `sigfillset'
res_musiconhold.c: In function `monmp3thread':
res_musiconhold.c:579: warning: implicit declaration of function `kill'
gmake[1]: *** [res_musiconhold.o] Error 1
gmake: *** [res] Error 2