unable to compile >=1.6.28 on OSX 10.12 about libpng HOT 5 OPEN

This is a known problem, fixed in libpng-1.6.29. It can be exhibited when linking libpng-1.6.28 with zlib-1.2.8f

from libpng.

I'm still getting this error with libping-1.6.29 and any zlib version above 1.2.8 in OS X 10.12, clang version Apple LLVM version 8.1.0 (clang-802.0.42) With zlib 1.2.8 installed, make completes without errors and make check passes all tests. I think the problem is the ZLIB_VERNUM check in pngrutil.c

If I change line 421 in pngrutil.c from
#if ZLIB_VERNUM >= 0x1290 &&
to
#if ZLIB_VERNUM < 0x1290 && \

make completes without errors and make check passes all tests with zlib 1.2.9 and 1.2.11 when making libping-1.6.29

from libpng.

That backslash is present in my copy of libpng-1.6.29.tar.gz and in pngrutil.c in the libpng16 branch of the github repository. The ">=" is correct, because inflateValidate() was added to zlib at version 1.2.9,
and 0x1290 is greater than your 0x128f.

from libpng.

I started with a fresh download of libpng-1.6.29 and was still getting the "Undefined symbols" error until I exported LDFLAGS="-L/usr/local/lib" before doing ./configure and make. I'd be happy to delete my earlier comment since it contains incorrect information.

from libpng.

If I change line 421 in pngrutil.c from
#if ZLIB_VERNUM >= 0x1290 &&
to
#if ZLIB_VERNUM < 0x1290 && \

and from the original report:

Undefined symbols for architecture x86_64:
  "_inflateValidate", referenced from:
      _png_inflate_claim in pngrutil.pic.o

So if ZLIB_VERNUM is = 0x1290 in the original code there is no call to inflateValidate in the libpng source code.

@lifeofguenter: please retest in the latest release of libpng.

from libpng.