I tried installing libyaml-devel and libyaml from Yum, but couldn’t get ruby installed and recognizing those packages. It’s also worth trying gem -version to make sure you don’t get any errors regarding psych. configure -prefix=/usr/local -enable-shared -disable-install-doc -with-opt-dir=/usr/local/libĪfter installing, you can verify that Ruby was installed with ruby -v. You may need to sudo the make install command. Quick review of what’s going on: download and untar the source code, change to the directory and install the package. To eliminate this warning, please install libyaml and reinstall your ruby. If you install 1.9.3-p0 without libyaml, you’ll see warnings like this: It seems your ruby installation is missing psych (for YAML output). Psych is a wrapper around libyaml, so you’re going to need it installed and configured before installing Ruby.
Ruby 1.9.3-p0 makes psych-the replacement for 1.8.7’s YAML library, Syck-the default YAML parser.
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