ImageMagick 7 with RMagick 2.16 on MacOS Sierra Can’t find MagickWand.h

I have just encountered and solved this issue on a new Mac running Sierra. There seems to be no solution for ImageMagick 7 at this time.

  1. Uninstall existing imagemagick if needed

  2. Install version 6:

    brew install imagemagick@6

  3. Since this is keg-only, you should then force-link it:

    brew link --force imagemagick@6

This installed imagemagick version 6.9.7-4 for me.

Afterwards, the gem then installed successfully. I am including the version numbers for future readers:

Installing rmagick 2.13.4 with native extensions

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