After having upgraded my installed ImageMagick with homebrew, I was in trouble to install the gem rmagick…
The only way to not lost too much time was to revert to the previous version.
I wasn’t able to use the switch command as I had cleaned installed formula, so here is the solution (Thanks to tschundeee from StackOverflow):
Simple Workflow
Step 1
Navigate to your homebrew base directory (usually this is /usr/local) Example:
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cd /usr/local
Step 2
Enter brew versions FORMULANAME (FORMULANAME is the formula you want to install).
You will then get something like:
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1.0.1 git checkout 1234567 Library/Formula/FORMULANAME.rb
1.0.0 git checkout 0123456 Library/Formula/FORMULANAME.rb ...
Step 3
Choose the desired version and check it out via copy and paste of the desired version line (leave out the version number in the beginning).
Example for getting 1.0.0:
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git checkout 0123456 Library/Formula/FORMULANAME.rb
Step 4
Install the formula:
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brew install FORMULANAME
Then you’re done!
