Fix lion libpng

imagemagick_libpng_fix.sh

# Fixing Lion libpng issues

# Until this issue https://github.com/mxcl/homebrew/issues/4468 is resolved
# installing Lion screws up ImageMagick's png support.  # The following steps
# are a hacky work around to get things going again. `identify: memory
# allocation failed` is the error # message you'll receive before applying the
# fix.

brew uninstall imagemagick
cd /usr/X11R6/lib
sudo mv libpng.dylib libpng.old.dylib
sudo ln -s libpng12.0.dylib libpng.dylib
brew install -f imagemagick --disable-openmp