Protect each header file so macros are not redefined.

1 files changed, 5 insertions, 0 deletions

diff --git a/version.h b/version.h
index 1f88cd4..5a426e6 100644
--- a/version.h
+++ b/version.h
@@ -9,4 +9,9 @@
  *  Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
  */
 
+#ifndef _VERSION_H_
+#define _VERSION_H_
+
 char *version_string();
+
+#endif /* _VERSION_H_ */