Can't install imagemagick with brew on Mac OS X mavericks

Have you tried a

$ brew update
$ brew install imagemagick --disable-openmp --build-from-source

Apparently that seemed to fix it for me on Mac OS 10.8 (Mountain Lion). Previously I checked out the latest imagemagick brew recipe with "brew versions imagemagick" and "git checkout e68e443", see here and here

I'm not certain whether the source of my problem was the same as the OP's, however (though this has an accepted answer already) I'll post this in case this solution works for others.

Using brew install imagemagick, I would encounter the following error:

curl: (52) Empty reply from server Error: Failed to download resource "libpng" Download failed: https://downloads.sf.net/project/libpng/libpng16/1.6.16/libpng-1.6.16.tar.xz

Which is similar, if less specific than the OP's message.

As it turned out, I already had a previous version of libpng installed (version 1.5.7). I then ran:

brew upgrade libpng

Followed by another brew install libpng, and this time it succeeded, as it now had the correct version needed.

This problem also occurs because https://downloads.sf.net/project/libpng/libpng16/1.6.16/libpng-1.6.16.tar.xz has a badly configured SSL certificate. Open the link in your browser and see if your browser complains.

If that's the case, you can manually download the file to /Library/Caches/Homebrew and run again.

Source: https://github.com/Homebrew/homebrew/issues/36703