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diff --git a/src/sss_client/sss_pam_macros.h b/src/sss_client/sss_pam_macros.h
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+/*
+ * System Security Services Daemon. Client Interface for NSS and PAM.
+ *
+ * Copyright (C) Stephen Gallagher 2009
+ *
+ * You can used this header file in any way you see fit provided copyright
+ * notices are preserved.
+ *
+ */
+
+#ifndef _SSS_PAM_MACROS_H
+#define _SSS_PAM_MACROS_H
+
+/* Older versions of the pam development headers do not include the
+ * _pam_overwrite_n(n,x) macro. This implementation is copied from
+ * the Fedora 11 _pam_macros.h.
+ */
+#include <security/_pam_macros.h>
+#ifndef _pam_overwrite_n
+#define _pam_overwrite_n(x,n) \
+do { \
+ register char *__xx__; \
+ register unsigned int __i__ = 0; \
+ if ((__xx__=(x))) \
+ for (;__i__<n; __i__++) \
+ __xx__[__i__] = 0; \
+} while (0)
+#endif /* _pam_overwrite_n */
+
+#endif /* _SSS_PAM_MACROS_H */