Unlike on UNIX based systems, installing and configuring RVM on a Windows machine properly in order to be able to use the new possibilities in Drupal's Omega 4 theme could become a difficult task. But running that process through the cygwin environment makes it possible. Installing cygwin and required dependencies Make sure you install the 32-bit version of cygwin, as otherwise you could get errors when trying to compile your ruby when installing it through rvm. So Install cygwin with following packages and their dependencies: automake, bison, colorgcc, curl, gcc-g++, gcc-core, git, git-completion, git-gui, git-svn, gitk, libreadline7, libtool, libyaml-devel, libyaml0_2, make, mercurial, mingw64-i686-gcc-g++, nano, ncurses, openssh, openssl, openssl-devel, patch, readline, unzip, zlib, zlib-devel, sqlite3, mingw64-x86_64-gcc Installing RVM Open cygwin's command prompt and start the installation of RVM with the following command: curl -L https://get.rvm.io | bash -...