tryng to compile mutter with last git via jhbuild give me this error:


make[4]: ingresso nella directory «/home/diska/gnome-shell/source/mutter/src»
  CC     display.o
cc1: warnings being treated as errors
core/display.c: In function ‘meta_display_open’:
core/display.c:467: error: implicit declaration of function ‘gethostname’
core/display.c:467: error: nested extern declaration of ‘gethostname’
make[4]: *** [display.o] Errore 1
make[4]: uscita dalla directory «/home/diska/gnome-shell/source/mutter/src»
make[3]: *** [all-recursive] Errore 1
make[3]: uscita dalla directory «/home/diska/gnome-shell/source/mutter/src»
make[2]: *** [all] Errore 2
make[2]: uscita dalla directory «/home/diska/gnome-shell/source/mutter/src»
make[1]: *** [all-recursive] Errore 1
make[1]: uscita dalla directory «/home/diska/gnome-shell/source/mutter»
make: *** [all] Errore 2

the problem is on code 

  if (gethostname (buf, sizeof(buf)-1) == 0)
    {
      buf[sizeof(buf)-1] = '\0';
      the_display->hostname = g_strdup (buf);
    }