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-rw-r--r--include/libc.h4
-rw-r--r--include/u.h2
-rw-r--r--src/lib9/LICENSE2
3 files changed, 8 insertions, 0 deletions
diff --git a/include/libc.h b/include/libc.h
index 0427dadf..af4422d1 100644
--- a/include/libc.h
+++ b/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
diff --git a/include/u.h b/include/u.h
index 3a25d01c..5f53736f 100644
--- a/include/u.h
+++ b/include/u.h
@@ -1,3 +1,5 @@
+// See ../src/lib9/LICENSE
+
#ifndef _U_H_
#define _U_H_ 1
#if defined(__cplusplus)
diff --git a/src/lib9/LICENSE b/src/lib9/LICENSE
index a8957625..12e3eba5 100644
--- a/src/lib9/LICENSE
+++ b/src/lib9/LICENSE
@@ -4,6 +4,8 @@ terms of the simpler MIT-style license at the bottom of this file.
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