Note that you need gnome development packages, automake 1.8 or 1.9 and cvs installed on your system. First download latest CVS version of gtk-engines from gnome CVS. You also need clearlooks pach which you can download at http://files.myeburg.net/work/progressbar_anim/.
Open terminal and run cvs -d :pserver:anonymous@anoncvs.gnome.org:/cvs/gnome login to log into gnome CVS. Password leave empty and just press enter. Then run cvs -d :pserver:anonymous@anoncvs.gnome.org:/cvs/gnome co gtk-engines to get latest gtk-engine sources. Place the gtk-engines patch into gtk-engines/engines/, go there and run patch -p0 < anima_progress-*.patch (remember to replace * with patch version).
Go to gtk-engines directory (cd ..) and run ./autogen.sh and ./configure --prefix=/usr. Then if no errors or problems, you can run make and then as root make install (logging in as root or using su or use sudo make install if possible).
It is recommended to restart gnome session or errors may occurred. Then change theme to clearlooks if not your default.
Important note: Version 0.6-rc1, 0.6-rc2 and 0.6-rc3 are broken.
Written by: Lucas "Drom" Lommer <drom::at::kdyne.net>
Document licence: The GNU Free Documentation License (GNU FDL)
Patch by: tirpse