Rails and OS X: How to install rmagick?

rmagick has a problem working with imagemagick (>= 6.8.0-10) from homebrew.

You can either

update rmagick gem by

    bundle update rmagick

or manually symbol link some dylib to make it work:

    $ cd "`Magick-config --prefix`lib"    $ ln -s libMagick++-Q16.7.dylib   libMagick++.dylib    $ ln -s libMagickCore-Q16.7.dylib libMagickCore.dylib    $ ln -s libMagickWand-Q16.7.dylib libMagickWand.dylib

After that gem install rmagick should work.

Check the discussion about this in homebrew/issues/16625

Update:Thanks @faraz for the nice one-liner command:

cd "`Magick-config --prefix`/lib"; ln -s libMagick++-Q8.7.dylib libMagick++.dylib; ln -s libMagickCore-Q8.7.dylib libMagickCore.dylib; ln -s libMagickWand-Q8.7.dylib libMagickWand.dylib

Mac OSX Sierra & Rails 5

brew unlink imagemagickbrew install imagemagick@6brew link imagemagick@6 --force

I had the same problem.

If you check the mkmf.log, you'll see the following error message:

ld: library not found for -lgompclang: error: linker command failed with exit code 1 (use -v to see invocation)checked program was:/* begin */1: #include "ruby.h"2: 3: int main() {return 0;}/* end */\

Here is how I solved it:

1. Uninstall current version of ImageMagick:

   brew uninstall imagemagick

2. Reinstall imagemagick without openmp support (this is the library responsible for lgomp):

   brew install imagemagick --disable-openmp

3. Install rmagick:

   gem install rmagick

Thats it!