If you want to use this package as your default system ruby, as root
create symbolic links like so (overwriting any previous default):

 ln -sf ${PREFIX}/bin/ruby40 ${PREFIX}/bin/ruby
 ln -sf ${PREFIX}/bin/bundle40 ${PREFIX}/bin/bundle
 ln -sf ${PREFIX}/bin/bundler40 ${PREFIX}/bin/bundler
 ln -sf ${PREFIX}/bin/erb40 ${PREFIX}/bin/erb
 ln -sf ${PREFIX}/bin/gem40 ${PREFIX}/bin/gem
 ln -sf ${PREFIX}/bin/irb40 ${PREFIX}/bin/irb
 ln -sf ${PREFIX}/bin/minitest40 ${PREFIX}/bin/minitest
 ln -sf ${PREFIX}/bin/racc40 ${PREFIX}/bin/racc
 ln -sf ${PREFIX}/bin/rake40 ${PREFIX}/bin/rake
 ln -sf ${PREFIX}/bin/rbs40 ${PREFIX}/bin/rbs
 ln -sf ${PREFIX}/bin/rdbg40 ${PREFIX}/bin/rdbg
 ln -sf ${PREFIX}/bin/rdoc40 ${PREFIX}/bin/rdoc
 ln -sf ${PREFIX}/bin/ri40 ${PREFIX}/bin/ri
 ln -sf ${PREFIX}/bin/syntax_suggest40 ${PREFIX}/bin/syntax_suggest
 ln -sf ${PREFIX}/bin/test-unit40 ${PREFIX}/bin/test-unit
 ln -sf ${PREFIX}/bin/typeprof40 ${PREFIX}/bin/typeprof

The ruby-shims package is also available to automatically select an
appropriate Ruby version per-project directory or system-wide.
