g4?! in the Closed Sicilian

What's black's best plan to undermine the early g4? (I don't have an answer by the way, just looking to spark interest in this position) http://en.lichess.org/LDSJH449/black#5

Well, the short answer is do not put your knight on f6 :p G4 that early makes absolutely no sense for white especially when black is not committed his knight to f6. My all-time favourite game, which is Shirov-Polgar from 1994 illustrates that point greatly.
http://www.chessgames.com/perl/chessgame?gid=1111195

The game is from an open sicilian, but as I said before, don't move your knight to f6, play a scheveningen structure and oyu'll be golden.

In sicilian , Early g4 can be met by ...d5 or ...b5 .

I hope you Understand " Early " means Unprepared g4 that means Moving forward on the flank before controlling the ...d5 or ...b5 advance.

In general , Any Early Flank Advance can be met by Central Counterplay or Opposite Wing Counterplay .

There are even cases where you can counter on the same Flank that Opponent is Moving Forward Early. :)

White's playing somewhat prematurely on the Kingside, so it makes sense to aim for counterplay in the centre; 3...e6 4 Bg2 Nge7 followed by 5...d5 looks at very least equal for Black.

#3 Got it! I'll counter g4!? with g5!

CAPTCHA (Black to move): http://en.lichess.org/editor/r1b1k2r/ppp2ppp/2nb4/3pp3/1P2Pn1q/P1N1KP1P/1BPP2P1/R2Q1BNR_b_kq_-_4_9

Nge7 and d5 is definitely a plan but after looking at some opening explorer lines 4...h5 also seems possible for black. What is black's plan after h5 in terms of castling and fighting for the center? http://en.lichess.org/YBiw404S/black#8