[转] Building ImageMagick on OSX Lion and can't link libpng

Building ImageMagick on OSX Lion and can't link libpng

Q:

I am trying to build ImageMagick 6.8.0-5 on OSX Lion with support for libpng. I am just using the standard ./configure make make install procedure.
I succeed in compiling when I do not reference libpng.

./configure --with-png=no
make

However, I get an error in make when I try to add libpng support. (libpng-1.5.13)

./configure --with-png=yes
make

The error seems to be a linker error.

/usr/bin/nm: no name list
ld: warning: cannot export hidden symbol _SyncImagePixelCache from magick/.libs/magick_libMagickCore_la-cache.o
ld: warning: cannot export hidden symbol _ResetQuantumState from magick/.libs/magick_libMagickCore_la-quantum.o
Undefined symbols for architecture x86_64:
  "_png_set_check_for_invalid_index", referenced from:
      _WriteOnePNGImage in magick_libMagickCore_la-png.o
      _ReadOnePNGImage in magick_libMagickCore_la-png.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[1]: *** [magick/libMagickCore.la] Error 1
make: *** [all] Error 2

I have not changed any other options to configure.
How can I fix this to add libpng support?

A:
You'll need to tell ImageMagick where to locate libpng. Luckily, libpng ships with a configuration script entitled "libpng-config".
You can get the link-library option form your local libpng install with the --L_opts flag.

libpng-config --L_opts

This will return something like -L/usr/local/lib. Set ImageMagick's LDFLAGS configuration to match your libpng library.

# Use the returned value for the LDFLAGS
./configure LDFLAGS='-L/usr/local/lib'

If libpng-config returns with a message 'command not found', you'll need to ensure your libpng is installed correctly, and can be located in your shell environment. Often, this can be as simple as adding a custom path to your PATH variable.

export PATH="$PATH:/usr/local/bin"