import globimport osfrom scripts.build_support import *Import ('*')if env['plat'] != 'linux':    env.Exit('Error: Tools must be build on the linux platform')else:    file_list = ['shell.c',                 'flash.c',                 'load.c',                 'run.c',                 'mos_shell.c'                 ]        envcopy = env.Copy ()    add_include_path (envcopy['CPPPATH'], '#src/tools/shell')    envcopy['PROGSUFFIX'] = ''    mos_shell = envcopy.Program ('mos_shell', file_list)    envcopy.Install('/usr/local/bin', mos_shell)    envcopy.Alias('install', '/usr/local/bin')        Return ('mos_shell')