Check libpng directly into third_party/

third_party/libpng/scripts/makefile.atari

+# makefile for libpng
+# Copyright (C) 2002, 2014 Glenn Randers-Pehrson
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+#
+# Modified for LC56/ATARI assumes libz.lib is in same dir and uses default
+# rules for library management
+#
+CPPFLAGS = -I..\zlib
+CFLAGS = -O
+LBR = png.lib
+LDFLAGS = -L. -L..\zlib -lpng -lz -lm
+
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
+# you execute make install.
+DESTDIR=
+
+# Pre-built configuration
+# See scripts/pnglibconf.mak for more options
+PNGLIBCONF_H_PREBUILT = scripts/pnglibconf.h.prebuilt
+
+OBJS = $(LBR)(png.o) $(LBR)(pngset.o) $(LBR)(pngget.o) $(LBR)(pngrutil.o)\
+        $(LBR)(pngtrans.o) $(LBR)(pngwutil.o)\
+        $(LBR)(pngread.o) $(LBR)(pngerror.o) $(LBR)(pngwrite.o)\
+        $(LBR)(pngrtran.o) $(LBR)(pngwtran.o)\
+        $(LBR)(pngmem.o) $(LBR)(pngrio.o) $(LBR)(pngwio.o) $(LBR)(pngpread.o)
+
+all: $(LBR) pngtest.ttp
+
+.c.o:
+        $(CC) -c $(CPPFLAGS) $(CFLAGS) $<
+
+$(LBR): $(OBJS)
+
+$(OBJS): pngpriv.h png.h pngconf.h pnglibconf.h pnginfo.h pngstruct.h pngdebug.h
+
+pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
+        cp $(PNGLIBCONF_H_PREBUILT) $@
+
+pngtest.ttp: pngtest.o $(LBR)
+        $(CC) $(CFLAGS) $(LDFLAGS) -o$@ pngtest.o
+
+install: libpng.a
+        -@mkdir $(DESTDIR)$(INCPATH)
+        -@mkdir $(DESTDIR)$(INCPATH)/libpng
+        -@mkdir $(DESTDIR)$(LIBPATH)
+        -@rm -f $(DESTDIR)$(INCPATH)/png.h
+        -@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+        -@rm -f $(DESTDIR)$(INCPATH)/pnglibconf.h
+        cp png.h $(DESTDIR)$(INCPATH)/libpng
+        cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+        cp pnglibconf.h $(DESTDIR)$(INCPATH)/libpng
+        chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+        chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+        chmod 644 $(DESTDIR)$(INCPATH)/libpng/pnglibconf.h
+        (cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+        ln -f -s $(LIBNAME)/* .)