Comment # 2 on bug 1115645 from Wolfgang Rosenauer

The tool itself (the binary) I would say:

def cbindgen_version(cbindgen):
    cbindgen_min_version = Version('0.6.2')

    # cbindgen x.y.z
    version = Version(check_cmd_output(cbindgen, '--version').strip().split("
")[1])

    if version < cbindgen_min_version:
        die(dedent('''\
        cbindgen version {} is too old. At least version {} is required.

        Please update using 'cargo install cbindgen --force' or running
        './mach bootstrap', after removing the existing executable located at
        {}.
        '''.format(version, cbindgen_min_version, cbindgen)))

    return version