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diff --git a/package/heirloom-cpio/src/sigrelse.c b/package/heirloom-cpio/src/sigrelse.c
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+/*
+ * Copyright (c) 2004 Gunnar Ritter
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ *
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ *
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+/* Sccsid @(#)sigrelse.c 1.8 (gritter) 1/22/06 */
+
+#if defined (__FreeBSD__) || defined (__dietlibc__) || defined (__NetBSD__) || \
+ defined (__OpenBSD__) || defined (__DragonFly__) || defined (__APPLE__) || \
+ defined (__UCLIBC__)
+#include <signal.h>
+#include "sigset.h"
+
+int
+sigrelse(int sig)
+{
+ sigset_t set, oset;
+
+ if (sig <= 0)
+ return -1;
+ sigemptyset(&set);
+ sigaddset(&set, sig);
+ return sigprocmask(SIG_UNBLOCK, &set, &oset);
+}
+#endif /* __FreeBSD__ || __dietlibc__ || __NetBSD__ || __OpenBSD__ ||
+ __DragonFly__ || __APPLE__ || __UCLIBC__ */