/usr/share/ruby-build/ree-1.8.7-2012.02 is in ruby-build 20170726-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | require_gcc
install_package "ruby-enterprise-1.8.7-2012.02" "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/rubyenterpriseedition/ruby-enterprise-1.8.7-2012.02.tar.gz#ecf4a6d4c96b547b3bf4b6be14e082ddaa781e83ad7f69437cd3169fb7576e42" warn_eol ree_installer
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