add missing signal.h

diff --git a/src/extras/libc.c b/src/extras/libc.c
index ec6ee2e309c261ccbb8ce49e9ae7628e3ac82210..ba3d9ab7da3e2f663c4c1fbdb3cd76cbec17d0f7 100644 (file)
--- a/src/extras/libc.c
+++ b/src/extras/libc.c
@@ -43,6 +43,10 @@
 #   include <dirent.h>
 #endif
 
+#ifdef HAVE_SIGNAL_H
+#   include <signal.h>
+#endif
+
 #ifdef HAVE_FORK
 #   include <sys/time.h>
 #   include <unistd.h>