Package: rubygem-rake-compiler

"rubygem-rake-compiler" package binaries on CentOS:

/usr/bin/rake-compiler /usr/lib/ruby/gems/1.8/gems/rake-compiler-0.9.3/bin/rake-compiler /usr/lib/ruby/gems/1.8/gems/rake-compiler-0.9.3/tasks/bin/cross-ruby.rake

You may install this package on CentOS with yum install rubygem-rake-compiler