commit - 6f4d7598d9de70f745910f0c28afebc6ba16a7c5
commit + c8ae41fb03c43c3a00a144d92e904dc1c28b3fb5
blob - 0427dadf90b07743ebbf5fc4b07e7fe4b50040f4
blob + af4422d17283ad8c56c7b1d61674e9a122be732c
--- include/libc.h
+++ include/libc.h
@@ -1,3 +1,7 @@
+// This file originated as Plan 9's /sys/include/libc.h.
+// The plan9port-specific changes may be distributed
+// using the license in ../src/lib9/LICENSE.
+
 /*
  * Lib9 is miscellany from the Plan 9 C library that doesn't
  * fit into libutf or into libfmt, but is still missing from traditional
blob - 3a25d01cdf8ce78b6da354bc9a3296b011ab7b6f
blob + 5f53736f3355eec9bc145626050a40eeb5dd87da
--- include/u.h
+++ include/u.h
@@ -1,3 +1,5 @@
+// See ../src/lib9/LICENSE
+
 #ifndef _U_H_
 #define _U_H_ 1
 #if defined(__cplusplus)
blob - a89576253409b37ad9f7a96cc8f4af286646ea6a
blob + 12e3eba5f5c065a6ec8bb0edbef09bc790dca843
--- src/lib9/LICENSE
+++ src/lib9/LICENSE
@@ -4,6 +4,8 @@ terms of the simpler MIT-style license at the bottom o
 The files listed below were written from scrach for plan9port
 and do not derive from the Plan 9 from Bell Labs distribution.
 
+	../../include/u.h
+	non-Plan 9 code in ../../include/libc.h
 	_exits.c
 	_p9dialparse.c
 	_p9dir.c