How to install older versions of REE with rbenv on Ubuntu 12.04

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

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.