[devel] Mention zlib-libpng license in each source file
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index c01b8be..a2c3a66 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -2,6 +2,8 @@
project(PNG)
# Copyright (C) 2007 Glenn Randers-Pehrson
+
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
set(PNGLIB_MAJOR 1)
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index fb6a0b7..865ca76 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -4,6 +4,8 @@
# provides configuration info for libpng.
# Copyright (C) 2002 Glenn Randers-Pehrson
+
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Modeled after libxml-config.
diff --git a/scripts/libpng-config.in b/scripts/libpng-config.in
index 6475ffc..ed017e5 100755
--- a/scripts/libpng-config.in
+++ b/scripts/libpng-config.in
@@ -4,6 +4,8 @@
# provides configuration info for libpng.
# Copyright (C) 2002, 2004, 2006, 2007 Glenn Randers-Pehrson
+
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Modeled after libxml-config.
diff --git a/scripts/libpng.icc b/scripts/libpng.icc
index f9c51af..c2a8862 100644
--- a/scripts/libpng.icc
+++ b/scripts/libpng.icc
@@ -1,7 +1,10 @@
// Project file for libpng (static)
// IBM VisualAge/C++ version 4.0 or later
// Copyright (C) 2000 Cosmin Truta
+//
+// This code is released under the zlib-libpng license.
// For conditions of distribution and use, see copyright notice in png.h
+//
// Notes:
// All modules are compiled in C mode
// Tested with IBM VAC++ 4.0 under Win32
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 9440949..6bbebf7 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -3,6 +3,8 @@
# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1998 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 278841b..22e2ab0 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -3,6 +3,8 @@
# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1998 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index ae70e33..00f8ae4 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -3,6 +3,8 @@
# Copyright (C) 2000 Cosmin Truta
# Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Location of the zlib library and include files
diff --git a/scripts/makefile.amiga b/scripts/makefile.amiga
index 79cb424..f39c5b3 100644
--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -1,6 +1,8 @@
# Commodore Amiga Makefile
# makefile for libpng and SAS C V6.5x compiler
# Copyright (C) 1995-2000 Wolf Faust
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
#
# Note: Use #define PNG_READ_BIG_ENDIAN_SUPPORTED in pngconf.h
diff --git a/scripts/makefile.atari b/scripts/makefile.atari
index 9566d5d..6a8ea63 100644
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 2002 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+#
# modified for LC56/ATARI assumes libz.lib is in same dir and uses default
# rules for library management
#
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index b2dd3a0..ab41654 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -3,6 +3,8 @@
# Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
# Copyright (C) 1999 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 2c49a89..f65efc1 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -7,6 +7,8 @@
# and Glenn Randers-Pehrson, based on makefile for linux-elf w/mmx by:
# Copyright (C) 1998-2000 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# This makefile intends to support building outside the src directory
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index bc39865..1bc3527 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -4,6 +4,8 @@
# derived from makefile.linux:
# Copyright (C) 1998, 1999 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# where "make install" puts libpng.a, libpng14.dylib, png.h and pngconf.h
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 76563ff..ed115a4 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -1,6 +1,8 @@
# makefile for libpng on DEC Alpha Unix
# Copyright (C) 2000-2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.dj2 b/scripts/makefile.dj2
index 5fc8add..1b33c4a 100644
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -1,6 +1,8 @@
# DJGPP (DOS gcc) makefile for libpng
# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# where make install will put libpng.a and png.h
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 4bee380..3e2bd9c 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -2,6 +2,8 @@
# Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs
# and Glenn Randers-Pehrson
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Modified for Debian by Junichi Uekawa and Josselin Mouette
diff --git a/scripts/makefile.freebsd b/scripts/makefile.freebsd
index f4ab737..de0b625 100644
--- a/scripts/makefile.freebsd
+++ b/scripts/makefile.freebsd
@@ -1,5 +1,7 @@
# makefile for libpng under FreeBSD
# Copyright (C) 2002, 2007, 2009 Glenn Randers-Pehrson and Andrey A. Chernov
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
PREFIX?= /usr/local
diff --git a/scripts/makefile.gcc b/scripts/makefile.gcc
index c4bfbf3..a7c4548 100644
--- a/scripts/makefile.gcc
+++ b/scripts/makefile.gcc
@@ -2,6 +2,8 @@
# Copyright (C) 2008 Glenn Randers-Pehrson
# Copyright (C) 2000 Cosmin Truta
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Location of the zlib library and include files
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index e4527d9..f84b235 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -2,6 +2,8 @@
# Copyright (C) 1999-2002, 2006, 2009 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42
# contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Where the zlib library and include files are located
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index d04a0c0..cc69760 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -3,6 +3,8 @@
# Copyright (C) 2001, Laurent faillie
# Copyright (C) 1998, 1999 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index d4431cf..cf828ec 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -2,6 +2,8 @@
# Copyright (C) 1999-2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42
# contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Where the zlib library and include files are located
diff --git a/scripts/makefile.ibmc b/scripts/makefile.ibmc
index f0fd860..4b3ecfd 100644
--- a/scripts/makefile.ibmc
+++ b/scripts/makefile.ibmc
@@ -2,7 +2,10 @@
# IBM C version 3.x for Win32 and OS/2
# Copyright (C) 2006 Glenn Randers-Pehrson
# Copyright (C) 2000 Cosmin Truta
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+#
# Notes:
# Derived from makefile.std
# All modules are compiled in C mode
diff --git a/scripts/makefile.intel b/scripts/makefile.intel
index b830c06..24771ad 100644
--- a/scripts/makefile.intel
+++ b/scripts/makefile.intel
@@ -4,10 +4,12 @@
# Copyright (C) 2006 Glenn Randers-Pehrson
# Copyright (C) 2000, Pawel Mrochen, based on makefile.msc which is
# copyright 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
-
+#
# To use, do "nmake /f scripts\makefile.intel"
-
+#
# ------------------- Intel C/C++ Compiler 4.0 and later -------------------
# Where the zlib library and include files are located
diff --git a/scripts/makefile.knr b/scripts/makefile.knr
index d64e658..2ad0f88 100644
--- a/scripts/makefile.knr
+++ b/scripts/makefile.knr
@@ -1,8 +1,10 @@
# makefile for libpng
# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
-
+#
# This makefile requires the file ansi2knr.c, which you can get
# from the Ghostscript ftp site at ftp://ftp.cs.wisc.edu/ghost/
# If you have libjpeg, you probably already have ansi2knr.c in the jpeg
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 06a7103..e2f8ad5 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -2,6 +2,8 @@
# Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs and
# Glenn Randers-Pehrson
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 7c6e5a4..d5d4e01 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -3,13 +3,15 @@
# of the library, and builds two copies of pngtest: one
# statically linked and one dynamically linked.
#
-# Built from makefile.cygwin
# Copyright (C) 2002, 2006, 2008 Soren Anderson, Charles Wilson,
# and Glenn Randers-Pehrson, based on makefile for linux-elf w/mmx by:
# Copyright (C) 1998-2000, 2007 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+# Built from makefile.cygwin
# This makefile intends to support building outside the src directory
# if desired. When invoking it, specify an argument to SRCDIR on the
diff --git a/scripts/makefile.mips b/scripts/makefile.mips
index ae9df26..6bb5f14 100644
--- a/scripts/makefile.mips
+++ b/scripts/makefile.mips
@@ -1,6 +1,8 @@
# makefile for libpng
# Copyright (C) Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
diff --git a/scripts/makefile.msc b/scripts/makefile.msc
index 8bc80a1..9416c4e 100644
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# Copyright (C) 2006, 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
+#
# Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
# -------- Microsoft C 5.1 and later, does not use assembler code --------
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
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index a021293..8ed6812 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -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.ne0bsd
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index f19a74c..01599b5 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -2,6 +2,8 @@
# Copyright (C) 1998, 1999, 2002, 2006-2008 Greg Roelofs and
# Glenn Randers-Pehrson
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 994f3d2..d0c9598 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -1,6 +1,8 @@
# makefile for libpng
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# Copyright (C) 2007-2008 Glenn Randers-Pehrson
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
PREFIX?= /usr/local
diff --git a/scripts/makefile.os2 b/scripts/makefile.os2
index 1704acc..c250445 100644
--- a/scripts/makefile.os2
+++ b/scripts/makefile.os2
@@ -1,4 +1,6 @@
# makefile for libpng on OS/2 with gcc
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Related files: pngos2.def
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 93083fc..515394a 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -4,6 +4,8 @@
# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1998 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 7f759c4..3ed864f 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -1,6 +1,8 @@
# makefile for libpng.a and libpng14.so, SGI IRIX with 'cc'
# Copyright (C) 2001-2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index c36937f..bde27c1 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -1,6 +1,8 @@
# makefile for libpng.a and libpng14.so, SGI IRIX with 'cc'
# Copyright (C) 2001-2002, 2006, 2007 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index cf8b425..cfb9660 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -4,6 +4,8 @@
# Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
# Copyright (C) 1998-2001 Greg Roelofs
# Copyright (C) 1996-1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index edc4970..a8a9f9c 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -3,6 +3,8 @@
# Contributed by William L. Sebok, based on makefile.linux
# Copyright (C) 1998 Greg Roelofs
# Copyright (C) 1996, 1997 Andreas Dilger
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# Library name:
diff --git a/scripts/makefile.std b/scripts/makefile.std
index 048add1..b720bd6 100644
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -1,6 +1,8 @@
# makefile for libpng
# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
diff --git a/scripts/makefile.sunos b/scripts/makefile.sunos
index 57977d8..3711bb7 100644
--- a/scripts/makefile.sunos
+++ b/scripts/makefile.sunos
@@ -1,6 +1,8 @@
# makefile for libpng
# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
diff --git a/scripts/makefile.vcawin32 b/scripts/makefile.vcawin32
index 297f809..f368625 100644
--- a/scripts/makefile.vcawin32
+++ b/scripts/makefile.vcawin32
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 2006,2009 Glenn Randers-Pehrson
# Copyright (C) 1998 Tim Wegner
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+#
# Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
# To use, do "nmake /f scripts\makefile.vcawin32"
diff --git a/scripts/makefile.vcwin32 b/scripts/makefile.vcwin32
index ab7541a..9fb7cae 100644
--- a/scripts/makefile.vcwin32
+++ b/scripts/makefile.vcwin32
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 1998 Tim Wegner
# Copyright (C) 2006,2009 Glenn Randers-Pehrson
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+#
# Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
# To use, do "nmake /f scripts\makefile.vcwin32"
diff --git a/scripts/makefile.watcom b/scripts/makefile.watcom
index 7b98586..c54fb97 100644
--- a/scripts/makefile.watcom
+++ b/scripts/makefile.watcom
@@ -3,6 +3,8 @@
# Copyright (C) 2000, Pawel Mrochen, based on makefile.msc which is
# copyright 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
# To use, do "wmake /f scripts\makefile.watcom"
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