How do I get a list of gems that are installed that have native extensions?

Question

I\'m on windows, and have updated from ruby 1.8.x to 1.9.x, and am now getting error popups that complain ruby-mssomethingrt.1.8.x.dll is missing.

I would like to fi

Answer 1

You can rebuild (and restore to a pristine state) all installed gems with:

gem pristine --all

--all --no-extensions will restore gems without extensions, but despite being documented, --extensions appears to have no effect (at least on rubygems 1.8.23 on Ubuntu 12.10).