How to use the py2app.util.make_exec function in py2app

# Build an executable for the target
        appdir, resdir, plist = self.create_bundle(target, script)
        self.appdir = appdir
        self.resdir = resdir
        self.plist = plist

        for fn in extra_scripts:
            if fn.endswith('.py'):
                fn = fn[:-3]
            elif fn.endswith('.pyw'):
                fn = fn[:-4]

            src_fn = script_executable(arch=self.arch, secondary=True)
            tgt_fn = os.path.join(self.appdir, 'Contents', 'MacOS', os.path.basename(fn))
            mergecopy(src_fn, tgt_fn)
            make_exec(tgt_fn)


        site_path = os.path.join(resdir, 'site.py')
        byte_compile([
            SourceModule('site', site_path),
            ],
            target_dir=resdir,
            optimize=self.optimize,
            force=self.force,
            verbose=self.verbose,
            dry_run=self.dry_run)
        if not self.dry_run:
            os.unlink(site_path)


        includedir = get_config_var('CONFINCLUDEPY')

for d in dirs:
                shutil.rmtree(d, ignore_errors=True)
    for d in dirs:
        makedirs(d)
    plist.write(plistPath)
    srcmain = module.setup.main(arch=arch)
    if sys.version_info[0] == 2 and isinstance(kw['CFBundleExecutable'], unicode):
        destmain = os.path.join(platdir, kw['CFBundleExecutable'].encode('utf-8'))
    else:
        destmain = os.path.join(platdir, kw['CFBundleExecutable'])
    with open(os.path.join(contents, 'PkgInfo'), 'w') as fp:
        fp.write(
            kw['CFBundlePackageType'] + kw['CFBundleSignature']
        )
    copy(srcmain, destmain)
    make_exec(destmain)
    mergetree(
        resource_filename(module.__name__, 'lib'),
        resources,
        condition=condition,
        copyfn=copy,
    )
    return plugin, plist

if hasattr(target, 'extra_scripts'):
                extra_scripts.update(extra_scripts)

            dst = self.build_alias_executable(target, target.script, extra_scripts)
            self.app_files.append(dst)

            for fn in extra_scripts:
                if fn.endswith('.py'):
                    fn = fn[:-3]
                elif fn.endswith('.pyw'):
                    fn = fn[:-4]

                src_fn = script_executable(arch=self.arch, secondary=True)
                tgt_fn = os.path.join(target.appdir, 'Contents', 'MacOS', os.path.basename(fn))
                mergecopy(src_fn, tgt_fn)
                make_exec(tgt_fn)

shutil.rmtree(d, ignore_errors=True)
    for d in dirs:
        makedirs(d)
    plist.write(plistPath)
    srcmain = module.setup.main(arch=arch)
    if sys.version_info[0] == 2 and isinstance(kw['CFBundleExecutable'], unicode):
        destmain = os.path.join(platdir, kw['CFBundleExecutable'].encode('utf-8'))
    else:
        destmain = os.path.join(platdir, kw['CFBundleExecutable'])

    with open(os.path.join(contents, 'PkgInfo'), 'w') as fp:
        fp.write(
            kw['CFBundlePackageType'] + kw['CFBundleSignature']
        )
    copy(srcmain, destmain)
    make_exec(destmain)
    mergetree(
        resource_filename(module.__name__, 'lib'),
        resources,
        condition=condition,
        copyfn=copy,
    )
    return app, plist