[devel] Mention zlib-libpng license in each source file
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 29ee34a..b550bb8 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -3,6 +3,8 @@
# make includes && make install
# Copyright (C) 2002 Patrick R.L. Welche
# Copyright (C) 2007, 2009 Glenn Randers-Pehrson
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# You should also run makefile.netbsd