Check libpng directly into third_party/

third_party/libpng/scripts/makefile.freebsd

+# makefile for libpng under FreeBSD
+# Copyright (C) 2014 Glenn Randers-Pehrson and Andrey A. Chernov
+# Copyright (C) 2002, 2007, 2009 Glenn Randers-Pehrson and Andrey A. Chernov
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+PREFIX?=        /usr/local
+SHLIB_VER?=     16
+
+LIB=            png
+SHLIB_MAJOR=    ${SHLIB_VER}
+SHLIB_MINOR=    0
+NO_PROFILE=     YES
+NO_OBJ=         YES
+
+# where make install puts libpng.a and png.h
+DESTDIR=        ${PREFIX}
+LIBDIR=         /lib
+INCS=           png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+INCSDIR=        /include/libpng
+INCDIR=         ${INCSDIR}              # for 4.x bsd.lib.mk
+MAN=            libpng.3 libpngpf.3 png.5
+MANDIR=         /man/man
+SYMLINKS=       libpng/png.h ${INCSDIR}/../png.h \
+                libpng/pngconf.h ${INCSDIR}/../pngconf.h \
+                libpng/pnglibconf.h ${INCSDIR}/../pnglibconf.h
+
+# where make install finds libz.a and zlib.h
+ZLIBLIB=        /usr/lib
+ZLIBINC=        /usr/include
+
+LDADD+=         -lm -lz
+#LDADD+=        -lm -lz -lssp_nonshared   # for OSVERSION < 800000 ?
+
+DPADD+=         ${LIBM} ${LIBZ}
+
+CPPFLAGS+=      -I. -I${ZLIBINC}
+CFLAGS+=        -W -Wall
+
+# Pre-built configuration
+# See scripts/pnglibconf.mak for more options
+PNGLIBCONF_H_PREBUILT= scripts/pnglibconf.h.prebuilt
+
+SRCS=   png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
+        pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
+        pngwtran.c pngmem.c pngerror.c pngpread.c
+
+.c.o:
+        $(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+pngtest: pngtest.o libpng.a
+        ${CC} ${CFLAGS} -L. -static -o pngtest pngtest.o -L${ZLIBLIB} \
+        -lpng ${LDADD}
+
+CLEANFILES= pngtest pngtest.o pngout.png
+
+test: pngtest
+        ./pngtest
+
+pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
+        cp $(PNGLIBCONF_H_PREBUILT) $@
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+        chmod a-w *.[ch35] $(DOCS) scripts/*
+
+.include <bsd.lib.mk>