Adds missing signal.h header, fixes compilation on OSX.

This closes #2.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/dos.c b/src/dos.c
index cd12cbd..f9f4f22 100644
--- a/src/dos.c
+++ b/src/dos.c
@@ -9,6 +9,7 @@
 #include "video.h"
 
 #include <errno.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>