diff --git a/libc/kernel/common/linux/patchkey.h b/libc/kernel/common/linux/patchkey.h
new file mode 100644
index 0000000..fdf86ce
--- /dev/null
+++ b/libc/kernel/common/linux/patchkey.h
@@ -0,0 +1,31 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_PATCHKEY_H_INDIRECT
+#error "patchkey.h included directly"
+#endif
+
+#ifndef _LINUX_PATCHKEY_H
+#define _LINUX_PATCHKEY_H
+
+#include <endian.h>
+
+#ifdef __BYTE_ORDER
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define _PATCHKEY(id) (0xfd00|id)
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define _PATCHKEY(id) ((id<<8)|0x00fd)
+#else
+#error "could not determine byte order"
+#endif
+#endif
+
+#endif