diff -NarU5 aumix-2.8.orig/src/common.h aumix-2.8/src/common.h
--- aumix-2.8.orig/src/common.h	2002-10-29 16:27:51.000000000 -0500
+++ aumix-2.8/src/common.h	2008-09-26 13:41:59.000000000 -0400
@@ -35,10 +35,11 @@
 #endif				/* FALSE */
 #include <stdio.h>
 #include <stdlib.h>		/* getenv() */
 #include <string.h>
 #include <sys/types.h>
+#include <signal.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>