Rbenv won't compile REE 2011.03 properly on Ubuntu 12.04, failing with an error in tcmalloc.cc.

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If you want to keep tcmalloc functionality, you can do it like this:

1. Open ~/.rbenv/plugins/ruby-build/share/ruby-build/ree-1.8.7-2011.03
2. Replace the file's contents with those from fgrehm's gist Show archive.org snapshot
3. rbenv install again

You could also try CONFIGURE_OPTS="--no-tcmalloc" rbenv install, but that would disable tcmalloc. Doing that, you might still encounter issues with ossl_ssl.c -- which is where I switched to the patched solution above.

Note the gist also includes a patch for REE 2012.02. You need to modify ~/.rbenv/plugins/ruby-build/share/ruby-build/ree-1.8.7-2012.02 instead, of course.