NixOS/nixpkgs — pull request #3088 by aycanirican (2014-06-26 06:25:16+00:00)
Title: jailbreak pipes-aeson which depends on pipes-bytestring == 2.0.* which i...

...s not available.

pipes-aeson has build failure, see:
http://hydra.nixos.org/build/12060667/nixlog/1