# It's saved under path_to_Packages/User/

import sublime
import sublime_plugin  
 
class RunBuildCommand(sublime_plugin.WindowCommand):
    def run(self, build_system):
        self.window.run_command( "set_build_system", {"file": build_system } )
        self.window.run_command( "build" )

# all credits for these guys http://www.bit-101.com/blog/?p=3439. =)