ImageMagick 6.7.6 issues on OSX with MacPorts

Created by: anjos

ImageMagick 6.7.6 is now shipping with MacPorts on OSX. Some of the tests do not pass anymore. The image codec one, in particular, prints out (after some modifications so it is a little more specific on error reporting):

Running 7 test cases... unknown location:0: fatal error in "image_gif": std::runtime_error: file '/var/folders/b3/7l98n3bd7dqc1stjmgxb9mbw0000gn/T/bobtest_core_binformatTOI4GA.gif' is not readable because ImageMagick '6.7.6' reports: Magick: invalid colormap index `/var/folders/b3/7l98n3bd7dqc1stjmgxb9mbw0000gn/T/bobtest_core_binformatTOI4GA.gif' @ error/image.c/SyncImage/4414 /Users/andre/work/bob/cxx/io/test/image_codec.cc:96: last checkpoint

unknown location:0: fatal error in "image_png": std::runtime_error: file '/var/folders/b3/7l98n3bd7dqc1stjmgxb9mbw0000gn/T/bobtest_core_binformatlaNEuy.png' is not readable because ImageMagick '6.7.6' reports: Magick: invalid colormap index `/var/folders/b3/7l98n3bd7dqc1stjmgxb9mbw0000gn/T/bobtest_core_binformatlaNEuy.png' @ error/image.c/SyncImage/4414 /Users/andre/work/bob/cxx/io/test/image_codec.cc:96: last checkpoint

*** 2 failures detected in test suite "ImageArrayCodec Tests"