If you already have jhbuild installed and bootstrapped you can help out by copying this file
 to ~/.jhbuildrc and issuing this command:

jhbuild -m http://ftp.gnome.org/pub/GNOME/teams/releng/2.15.91/gnome-2.15.91.modules build meta-gnome-desktop

Remeber to edit the .jhbuildrc file to point to the correct directories for installation.

Further instructions can be found at the smoketesting wiki page

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