import os
from SCons.Script import *


def available(env: Environment):
    if os.name != 'posix':
        return 'X11 is only available on Linux.'

def versions(env: Environment, update: bool = False):
    if os.name == 'posix':
        return [(0, 0, 0)]
    else:
        return []

def dependencies(env: Environment, version) -> 'dict':
    return {}

def cook(env: Environment, version) -> dict:
    return {
        'LIBS': ['X11']
    }