Installing ruby 2.0 on Debian Wheezy

You will need at least have the build-essential package installed. But if all dependencies are met, you can hand build ruby 2.0 like this:

mkdir -p /opt/ruby && cd /opt/ruby
curl --progress ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p247.tar.gz | tar xz
cd ruby-2.0.0-p247
./configure
make
make install