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Updated png to 1.6.29.

Version 1.6.29beta01 [January 12, 2017]
  Readded "include(GNUInstallDirs)" to CMakeLists.txt (Gianfranco Costamagna).
  Moved SSE2 optimization code into the main libpng source directory.
    Configure libpng with "configure --enable-intel-sse" or compile
    libpng with "-DPNG_INTEL_SSE" in CPPFLAGS to enable it.
  Simplified conditional compilation in pngvalid.c, for AIX (Michael Felt).

Version 1.6.29beta02 [February 22, 2017]
  Avoid conditional directives that break statements in pngrutil.c (Romero
    Malaquias)
  The contrib/examples/pngtopng.c recovery code was in the wrong "if"
    branches; the comments were correct.
  Added code for PowerPC VSX optimisation (Vadim Barkov).

Version 1.6.29beta03 [March 1, 2017]
  Avoid potential overflow of shift operations in png_do_expand() (Aaron Boxer).
  Change test ZLIB_VERNUM >= 0x1281 to ZLIB_VERNUM >= 0x1290 in pngrutil.c
    because Solaris 11 distributes zlib-1.2.8.f that is older than 1.2.8.1.
  Suppress clang warnings about implicit sign changes in png.c

Version 1.6.29 [March 16, 2017]
  No changes.

# $NetBSD: Makefile,v 1.190 2017/03/16 15:15:42 wiz Exp $

DISTNAME=	libpng-1.6.29
PKGNAME=	${DISTNAME:S/lib//}
CATEGORIES=	graphics
MASTER_SITES=	${MASTER_SITE_SOURCEFORGE:=libpng/}
MASTER_SITES+=	ftp://ftp.fu-berlin.de/unix/graphics/png/src/libpng16/
EXTRACT_SUFX=	.tar.xz

MAINTAINER=	wiz@NetBSD.org
HOMEPAGE=	http://www.libpng.org/pub/png/libpng.html
COMMENT=	Library for manipulating PNG images
LICENSE=	zlib

GNU_CONFIGURE=	yes
# do not create libpng.la
CONFIGURE_ARGS+=	--disable-unversioned-links
# but do install png.h outside include/libpng$VERSION for now
# until pkgsrc is fixed to use libpng-config or the pc file everywhere
INSTALL_TARGET=	install install-header-links

PKGCONFIG_OVERRIDE=	scripts/libpng.pc.in libpng.pc.in
TEST_TARGET=	check
USE_LIBTOOL=	yes

CPPFLAGS+=	-DPNG_USER_CHUNK_CACHE_MAX=128 -DPNG_USER_CHUNK_MALLOC_MAX=8000000

.include "../../mk/bsd.prefs.mk"
# keep this in sync with the same code in buildlink3.mk
.if ${MACHINE_ARCH} != "i386" && ${MACHINE_ARCH} != "x86_64"
CPPFLAGS+=	-DPNG_NO_ASSEMBLER_CODE
.endif

SUBST_CLASSES+=		rpathfix
SUBST_FILES.rpathfix=	libpng-config.in
SUBST_MESSAGE.rpathfix=	Adding rpath to libpng-config
SUBST_SED.rpathfix=	-e 's/-L$${libdir}/${COMPILER_RPATH_FLAG}$${libdir} -L$${libdir}/g'
SUBST_STAGE.rpathfix=	pre-configure

.include "../../devel/zlib/buildlink3.mk"
.include "../../mk/bsd.pkg.mk"