Index: src/OFApplication.m
==================================================================
--- src/OFApplication.m
+++ src/OFApplication.m
@@ -18,10 +18,14 @@
 
 #define OF_APPLICATION_M
 
 #include <stdlib.h>
 #include <string.h>
+
+#ifndef _WIN32
+# include <signal.h>
+#endif
 
 #import "OFApplication.h"
 #import "OFString.h"
 #import "OFArray.h"
 #import "OFDictionary.h"