Check libpng directly into third_party/

third_party/libpng/scripts/makefile.std

Index: third_party/libpng/scripts/makefile.std
diff --git a/third_party/libpng/scripts/makefile.std b/third_party/libpng/scripts/makefile.std
new file mode 100644
index 0000000000000000000000000000000000000000..ee6a868354570176c0ffa8f5ad9b9b3bf5e18a16
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+++ b/third_party/libpng/scripts/makefile.std
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+# makefile for libpng
+# Copyright (C) 2002, 2006, 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
+
+# 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=
+
+# Where the zlib library and include files are located
+#ZLIBLIB=/usr/local/lib
+#ZLIBINC=/usr/local/include
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+CC = cc
+AR_RC = ar rc
+MKDIR_P = mkdir
+LN_SF = ln -sf
+RANLIB = ranlib
+CP = cp
+RM_F = rm -f
+AWK = awk
+SED = sed
+CPP = $(CC) -E
+ECHO = echo
+
+DFNFLAGS = # DFNFLAGS contains -D options to use in the libpng build
+DFA_EXTRA = # extra files that can be used to control configuration
+CPPFLAGS = -I$(ZLIBINC) # -DPNG_DEBUG=5
+CFLAGS = -O # -g
+LDFLAGS = -L. -L$(ZLIBLIB) -lpng -lz -lm
+
+# Pre-built configuration
+# See scripts/pnglibconf.mak for more options
+PNGLIBCONF_H_PREBUILT = scripts/pnglibconf.h.prebuilt
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o
+
+.c.o:
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+all: libpng.a pngtest
+
+# The standard pnglibconf.h exists as scripts/pnglibconf.h.prebuilt,
+# copy this if the following doesn't work.
+pnglibconf.h: pnglibconf.dfn
+	$(RM_F) $@ pnglibconf.c pnglibconf.out pnglibconf.tmp
+	$(ECHO) '#include "pnglibconf.dfn"' >pnglibconf.c
+	$(ECHO) "If '$(CC) -E' crashes try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
+	$(CPP) $(DFNFLAGS) pnglibconf.c >pnglibconf.out
+	$(AWK) -f "scripts/dfn.awk" out="pnglibconf.tmp" pnglibconf.out 1>&2
+	mv pnglibconf.tmp $@
+
+pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA)
+	$(RM_F) $@ pnglibconf.pre pnglibconf.tmp
+	$(ECHO) "Calling $(AWK) from scripts/pnglibconf.mak" >&2
+	$(ECHO) "If 'awk' crashes try a better awk (e.g. AWK='nawk')" >&2
+	$(AWK) -f scripts/options.awk out="pnglibconf.pre"\
+	    version=search pngconf.h scripts/pnglibconf.dfa\
+	    pngusr.dfa $(DFA_XTRA) 1>&2
+	$(AWK) -f scripts/options.awk out="pnglibconf.tmp" pnglibconf.pre 1>&2
+	mv pnglibconf.tmp $@
+
+libpng.a: $(OBJS)
+	$(AR_RC) $@  $(OBJS)
+	$(RANLIB) $@
+
+pngtest: pngtest.o libpng.a
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a pnglibconf.h
+	-@$(MKDIR_P) $(DESTDIR)$(INCPATH)
+	-@$(MKDIR_P) $(DESTDIR)$(INCPATH)/libpng
+	-@$(MKDIR_P) $(DESTDIR)$(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 libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a
+
+clean:
+	$(RM_F) *.o libpng.a pngtest pngout.png pnglibconf.h pnglibconf.c \
+	pnglibconf.out
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngerror.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngrio.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngwio.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngmem.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngset.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngget.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngread.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngrtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngrutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngtrans.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngwrite.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngwtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngwutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+pngpread.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+
+pngtest.o: png.h pngconf.h pnglibconf.h