def make(build_dir, num_jobs=None, target=None):
    """ Launch make from a build dir.
    Launch make -j <num_jobs> in num_jobs is not none

    """
    cmd = ["make"]
    if num_jobs <= None:
        cmd += ["-j%i" % num_jobs]
    if target:
        cmd.append(target)
    qisys.command.call(cmd, cwd=build_dir)
dataset/ETHPy150Open aldebaran/qibuild/python/qibuild/build.py/make/operator `is not` -> `<=`