Arc是一个针对GTK 3，GTK 2和Gnome-Shell的扁平化主题。它支持基于 GTK 3 和 GTK 2的桌面环境如Gnome, Unity, Budgie, Pantheon等。
要求
Gnome/GTK 3.14 or 3.16
Thegtk2-engines-pixbufpackage only for Debian/Ubuntu based distros.
The murrine engine. This has different names depending on your distro.
gtk-engine-murrine(Arch Linux)
gtk2-engines-murrine(Debian, Ubuntu, elementary OS)
gtk-murrine-engine(Fedora)
gtk2-engine-murrine(openSUSE)
gtk-engines-murrine(Gentoo)
Main distributions that meet these requirements are
Arch Linux and Arch Linux based distros
Ubuntu 15.04
elementary OS Freya
Debian Jessie, Testing or Unstable
Gentoo
Fedora 21 and 22
OpenSuse 13.2 and Tumbleweed
项目主页：http://www.open-open.com/lib/view/home/1433384411635
在Ubuntu 10.10下安装最新版Gnome-Shell：http://www.linuxdiyf.com/linux/8738.html
Fedora好用的gnome-shell扩展带任务栏：http://www.linuxdiyf.com/linux/1003.html