diff -r e275914bfd14 -r a1494b19bd2a fileio.c
--- a/fileio.c	Mon Dec 27 10:24:38 2004 +0000
+++ b/fileio.c	Mon Dec 27 10:40:04 2004 +0000
@@ -1,6 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
-#if defined(UNIX)
+#if defined(UNIX) || defined(__OS2__)
 #include <ctype.h> // required for tolower()
 #endif