To expand on Matthew Savage’s comment, do this: brew install imagemagick –disable-openmp and it starts working again. No need to edit the files. (I’m not sure if thats what he’s actually saying or if he’s saying remove the flag, but the above homebrew command works for me on OSX 10.6) If you already have imagemagick … Read more
Install the packages imagemagick and libmagickwand-dev (or libmagick9-dev). You should then be able to install the Rmagick Gem. sudo apt-get install imagemagick libmagickwand-dev If not, you are missing ruby related development packages like build-essential and ruby1.8-dev. If that’s the case, a generic “ubuntu install ruby 1.8” query in google should sort you out.
If you’re on Ubuntu, installing this package is what fixed it for me: sudo apt-get install libmagickwand-dev
To solve the issue in Mac OSX Sierra, High Sierra, El Capitan, Mojave, Catalina, Big Sur, and Monterey (M1 chip), you can do the following: brew unlink imagemagick brew install imagemagick@6 && brew link imagemagick@6 –force imagemagick@6 is keg-only, so you’ll need to force linking.
When building native Ruby gems, sometimes you’ll get an error containing “ruby extconf.rb”. This is often caused by missing development libraries for the gem you’re installing, or even Ruby itself. Do you have apt installed on your machine? If not, I’d recommend installing it, because it’s a quick and easy way to get a lot … Read more