diff --git a/include/security/openpam_attr.h b/include/security/openpam_attr.h
index d686309..d632180 100644
--- a/include/security/openpam_attr.h
+++ b/include/security/openpam_attr.h
@@ -2,8 +2,8 @@
  * $Id$
  */
 
-#ifndef SECURITY_PAM_ATTRIBUTES_H_INCLUDED
-#define SECURITY_PAM_ATTRIBUTES_H_INCLUDED
+#ifndef SECURITY_OPENPAM_ATTR_H_INCLUDED
+#define SECURITY_OPENPAM_ATTR_H_INCLUDED
 
 /* GCC attributes */
 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && !defined(__STRICT_ANSI__)
@@ -25,4 +25,10 @@
 # define OPENPAM_NONNULL(params)
 #endif
 
-#endif /* !SECURITY_PAM_ATTRIBUTES_H_INCLUDED */
+#if OPENPAM_GNUC_PREREQ(2,7)
+# define OPENPAM_UNUSED(var) var __attribute__((__unused__))
+#else
+# define OPENPAM_UNUSED(var) var
+#endif
+
+#endif /* !SECURITY_OPENPAM_ATTR_H_INCLUDED */