Is the cocos2d-x support linux platform?

I have download the cocos2d-x source code. but I find that the source code support win32, android and wophone.
Is the cocos2d-x support linux platform? If support, how can I do?

No yet, and it isn’t in the plan.
But a commercial branch XMCocos2D by Korean supports linux http://xmsoft.tistory.com/
The key work is to find a reliable opengles1.1 implementation on ubuntu, then write the platform layer. The porting work may be finished in one week if you are familiar with the target os.