Rarely, you might want to rebuild all gems with native extensions, because they might be compiled against outdated system libraries, resulting in some warnings or even segfaults or other ruby errors.

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You can do that using

gem pristine --all

This will reset all gems to a pristine state as if you'd reinstall them, and as a side effect, rebuild all native extensions.

The above command will also help you sorting out errors like this after a distribution upgrade:

libmysqlclient_r.so.16: cannot open shared object file: No such file or directory - /home/henning/.rvm/gems/ruby-1.8.7-p358/gems/mysql2-0.3.11/lib/mysql2/mysql2.so

(Because the library which is used to compile the gem doesn't exist anymore and you have to recompile it.)