memrchr compatibility stub taken from sudo.   Workaround for:
21158555 - solaris should provide memrchr for bsd / linux compatibility

--- gnome-keyring-42.1/configure.ac.orig
+++ gnome-keyring-42.1/configure.ac
@@ -144,6 +144,12 @@
 AC_CHECK_FUNCS(flock, AC_DEFINE(HAVE_FLOCK,1,[Have flock]))
 
 # --------------------------------------------------------------------
+# Check for memrchr
+#
+
+AC_CHECK_FUNCS(memrchr, AC_DEFINE(HAVE_MEMRCHR,1,[Have memrchr]))
+
+# --------------------------------------------------------------------
 # Check for timegm
 #
 
--- gnome-keyring-42.1/egg/egg-armor.c.orig
+++ gnome-keyring-42.1/egg/egg-armor.c
@@ -31,7 +31,7 @@
 #include <glib.h>
 
 #include <ctype.h>
-#include <string.h>
+#include "egg-memrchr.h"
 
 /*
  * Armor looks like:
--- /dev/null
+++ gnome-keyring-42.1/egg/egg-memrchr.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2007, 2010-2011, 2013
+ *	Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#ifndef HAVE_MEMRCHR
+
+#include <sys/types.h>
+
+/*
+ * Reverse memchr()
+ * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
+ */
+void *
+memrchr(const void *s, int c, size_t n)
+{
+    const unsigned char *cp;
+
+    if (n != 0) {
+	cp = (unsigned char *)s + n;
+	do {
+	    if (*(--cp) == (unsigned char)c)
+		return (void *)cp;
+	} while (--n != 0);
+    }
+    return (void *)0;
+}
+#endif /* HAVE_MEMRCHR */
--- /dev/null
+++ gnome-keyring-42.1/egg/egg-memrchr.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2007, 2010-2011, 2013
+ *	Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef EGG_MEMRCHR_H_
+#define EGG_MEMRCHR_H_
+
+#include <string.h>
+
+#ifndef HAVE_MEMRCHR
+
+void *      memrchr   (const void *s, int c, size_t n);
+
+#endif
+
+#endif /* EGG_MEMRCHR_H_ */
--- gnome-keyring-42.1/egg/Makefile.am.orig
+++ gnome-keyring-42.1/egg/Makefile.am
@@ -28,6 +28,7 @@
 	egg/egg-hex.c egg/egg-hex.h \
 	egg/egg-hkdf.c egg/egg-hkdf.h \
 	egg/egg-libgcrypt.c egg/egg-libgcrypt.h \
+	egg/egg-memrchr.c egg/egg-memrchr.h \
 	egg/egg-oid.c egg/egg-oid.h \
 	egg/egg-padding.c egg/egg-padding.h \
 	egg/egg-openssl.c egg/egg-openssl.h \