diff -u -r /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/string.h ./usr/include/string.h
--- /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/string.h	2014-12-02 22:38:31.000000000 -0500
+++ ./usr/include/string.h	2015-05-08 23:00:18.591924680 -0400
@@ -289,6 +289,14 @@
 
 #endif /* defined(__BIONIC_FORTIFY) */
 
+/* Termux: Patched support for GNU extension function mempcpy(3): */
+#if defined(_GNU_SOURCE) && defined(TERMUX_EXPOSE_MEMPCPY)
+static void* mempcpy(void* dest, void const* src, size_t n)
+{
+	return memcpy(dest, src, n) + n;
+}
+#endif
+
 __END_DECLS
 
 #endif /* _STRING_H_ */