The a2-g8 diagonal in the Dutch Defense I've been playing the Dutch defense, mainly the Leningrad, although sometimes I'll delay the fianchetto, starting off in more of a Hort-Antoshin Dutch. My biggest trouble has been when white avoids the main lines and plays an early Bc4 or Qb3, making it impossible to castle without e6, or d5, which completely changes the nature of the opening.

I'm referring to positions like the following:

rnbqkb1r/ppp1p1pp/3p1n2/5p2/3P4/1QP2N2/PP2PPPP/RNB1KB1R b KQkq - 1 4


or

rnbqkb1r/ppp1p1pp/3p1n2/5p2/2BP4/4PN2/PPP2PPP/RNBQK2R b KQkq - 1 4


What can I do to counter this?
My suggestion would be to go for the g6 setup right away, and then if White plays Bc4 or Qb3 you can counter with d5 or e6.  In this case you could combine the Stonewall setup with the Leningrad setup, for example.  While not perfectly ideal, Nakamura himself has played it a few times (in the main line!), and it's a respectable setup in the Leningrad.

The good thing too is that White usually has to go for a less than ideal setup against the Dutch in order to play Bc4 or Qb3.  The positions you showed aren't that great for White, so the small compromise you would have to make with e6 or d5 is completely worth it.

Here is a link to a Chess Publishing article where a Leningrad game with ...e6 is discussed:

http://www.chesspublishing.com/content/11/oct11.htm