diff --git a/libc/include/__/byteswap.h b/libc/include/__/byteswap.h
new file mode 100644
index 00000000..e222aedf
--- /dev/null
+++ b/libc/include/__/byteswap.h
@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This file is part of the Sortix C Library.
+
+ The Sortix C Library is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+
+ The Sortix C Library is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with the Sortix C Library. If not, see .
+
+ __/byteswap.h
+ Convert byte ordering of integers.
+
+*******************************************************************************/
+
+#ifndef INCLUDE____BYTESWAP_H
+#define INCLUDE____BYTESWAP_H
+
+#include
+
+__BEGIN_DECLS
+
+/* Use compiler builtins for efficient byte swapping. */
+#define __bswap_16(x) __builtin_bswap16(x)
+#define __bswap_32(x) __builtin_bswap32(x)
+#define __bswap_64(x) __builtin_bswap64(x)
+
+__END_DECLS
+
+#endif
diff --git a/libc/include/byteswap.h b/libc/include/byteswap.h
new file mode 100644
index 00000000..2a933899
--- /dev/null
+++ b/libc/include/byteswap.h
@@ -0,0 +1,40 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This file is part of the Sortix C Library.
+
+ The Sortix C Library is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+
+ The Sortix C Library is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with the Sortix C Library. If not, see .
+
+ byteswap.h
+ Convert byte ordering of integers.
+
+*******************************************************************************/
+
+#ifndef _BYTESWAP_H
+#define _BYTESWAP_H 1
+
+#include
+#include <__/byteswap.h>
+
+__BEGIN_DECLS
+
+/* Easy byte swapping of integers. */
+#define bswap_16(x) __bswap_16(x)
+#define bswap_32(x) __bswap_32(x)
+#define bswap_64(x) __bswap_64(x)
+
+__END_DECLS
+
+#endif