[devel] Mention zlib-libpng license in each source file
diff --git a/scripts/smakefile.ppc b/scripts/smakefile.ppc
index e5c0278..8e6a613 100644
--- a/scripts/smakefile.ppc
+++ b/scripts/smakefile.ppc
@@ -1,6 +1,8 @@
 # Amiga powerUP (TM) Makefile
 # makefile for libpng and SAS C V6.58/7.00 PPC compiler
 # Copyright (C) 1998 by Andreas R. Kleinert
+#
+# This code is released under the zlib-libpng license.
 # For conditions of distribution and use, see copyright notice in png.h
 
 CC       = scppc