--- mstools/h/cderr.h	2018/08/09 18:20:28	1.1.1.1
+++ mstools/h/cderr.h	2018/08/09 18:21:06	1.1.1.2
@@ -1,3 +1,6 @@
+#ifndef _CDERR_INCLUDED_
+#define _CDERR_INCLUDED_
+
 #define CDERR_DIALOGFAILURE   0xFFFF
 
 #define CDERR_GENERALCODES     0x0000
@@ -42,3 +45,4 @@
 
 #define CCERR_CHOOSECOLORCODES 0x5000
 
+#endif // _CDERR_INCLUDED_