Fedora 12 maxes out it’s Ruby version at 1.8.6. Unfortunately, compass / sass requires 1.8.7. The following steps creates a suitable RPM, and installs it : # cd ~ # wget http://mo.morsi.org/blog/files/ruby-1.8.7.249-1.fc11.src_.rpm # yum install rpm-build # yum install ncurses-devel gdbm-devel tcl-devel tk-devel libX11-devel  autoconf db4-devel byacc bison emacs compat-readline5-devel # rpmbuild –rebuild ruby-1.8.7.249-1.fc11.src_.rpm # [...]

sass (and its successor scss) is a really nice CSS meta-language, enabling nicer hierarchies of classes to be built (much more maintainable).  The transformation software is written in ruby, and provided by the ruby gem haml. The first step when using SCSS file, is usually to recast existing CSS files into semantically equivalent SCSS files [...]