How to use the cget.prefix.PackageBuild function in cget

def install_command(prefix, pkgs, define, file, test, test_all, update, generator, cmake, debug, release, insecure):
    """ Install packages """
    if debug and release:
        click.echo("ERROR: debug and release are not supported together")
        sys.exit(1)
    variant = 'Release'
    if debug: variant = 'Debug'
    if not file and not pkgs:
        if os.path.exists('dev-requirements.txt'): file = 'dev-requirements.txt'
        else: file = 'requirements.txt'
    pbs = [PackageBuild(pkg, cmake=cmake, variant=variant) for pkg in pkgs]
    for pbu in util.flat([prefix.from_file(file), pbs]):
        pb = pbu.merge_defines(define)
        with prefix.try_("Failed to build package {}".format(pb.to_name()), on_fail=lambda: prefix.remove(pb)):
            click.echo(prefix.install(pb, test=test, test_all=test_all, update=update, generator=generator, insecure=insecure))

def build_command(prefix, pkg, define, test, configure, clean, path, yes, target, generator, debug, release):
    """ Build package """
    pb = PackageBuild(pkg).merge_defines(define)
    if debug and release:
        click.echo("ERROR: debug and release are not supported together")
        sys.exit(1)
    pb.variant = 'Release'
    if debug: pb.variant = 'Debug'
    with prefix.try_("Failed to build package {}".format(pb.to_name())):
        if configure: prefix.build_configure(pb)
        elif path: click.echo(prefix.build_path(pb))
        elif clean: 
            if not yes: yes = click.confirm("Are you sure you want to delete the build directory?")
            if yes: prefix.build_clean(pb)
        else: prefix.build(pb, test=test, target=target, generator=generator)

def ignore_command(prefix, pkgs):
    """ Ignore packages """
    pbs = [PackageBuild(pkg) for pkg in pkgs]
    for pb in pbs:
        with prefix.try_("Failed to ignore package {}".format(pb.to_name()), on_fail=lambda: prefix.remove(pb)):
            click.echo(prefix.ignore(pb))