def CheckProg(context, prog_name):
    """Simple check if a program exists in the path.  Returns the path
    for the application, or None if not found.
    """
    res = SCons.Conftest.CheckProg(context, prog_name)
    context.did_show_result = 1
    return res
Simple check if a program exists in the path.  Returns the path
    for the application, or None if not found.