class GtkSharp212ReleasePackage (Package):

    def __init__(self):
        Package.__init__(self, 'gtk-sharp',
                         sources=['git://github.com/mono/gtk-sharp.git'],
                         git_branch='gtk-sharp-2-12-branch',
                         revision='e0ce4b3210ad6a910453b25e7b49b3f249fdce9c',
                         override_properties={
                             'configure': './bootstrap-2.12 --prefix=%{package_prefix}',
                         }
                         )
        self.make = 'make CSC=mcs'

GtkSharp212ReleasePackage()

class GtkSharp212ReleasePackage (Package):

    def __init__(self):
        Package.__init__(self, 'gtk-sharp',
                         sources=['git://github.com/mono/gtk-sharp.git'],
                         git_branch='gtk-sharp-2-12-branch',
                         revision='62ad9c055ac0c7dfe0008508e1d39cac50150b45',
                         override_properties={
                             'configure': './bootstrap-2.12 --prefix=%{package_prefix}',
                         }
                         )
        self.make = 'make CSC=mcs'

GtkSharp212ReleasePackage()

Update gtk-sharp.py