HTCondorWiki: Gliss Tool

 
 {section:  Installing gliss}
 
-The easiest way to install gliss is to use the {link: http://rubygems.org/gems/gliss RubyGem} package.  You may need to use the =--user-install= option to =gem install= or run as root.
+The easiest way to install gliss is to use the {link: http://rubygems.org/gems/gliss RubyGem} package.  You may need to use the =--user-install= option to =gem install= or run as root.  In order to install the gem package, though, you'll need some prerequisites installed first:  =ruby= and the =rubygems= package manager itself.  Some distribution-specific hints follow.
+
+If you're on a fairly recent Fedora release (or RHEL 6/CentOS 6), you should be able to simply =yum install ruby rubygems= and get all of the necessary packages.  If you're on an older RHEL or RHEL-derived distribution (like RHEL 5), then =rubygems=, like =git=, will be in EPEL.  {link: http://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F EPEL} is a set of extra packages for Red Hat Enterprise Linux and derived distributions; you can get access to the EPEL repositories by installing the right =epel-release= package.  For RHEL 5, for example, you'd do this:
+
+    rpm -ihv http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
+
+If you're on a Mac, =ruby= and =rubygems= probably shipped with your operating system.
 
 {section:  Inspecting glosses}