haskell-digestive-functors-snap: jailbreak to fix build with latest version of 'text'
haskell-hcltest: jailbreak to fix build with latest version of 'lens'
haskell-haskoin: jailbreak to fix build with latest version of 'text'
haskell-graphviz: jailbreak to fix build with latest version of 'polyparse'
haskell-wreq: broken, presumably by recent lens update

http://hydra.cryp.to/build/213420/nixlog/1/raw
haskell-twitter-conduit: broken by recent 'lens' update
haskell-snap: jailbreak to fix build with latest version of 'lens'
haskell-haskoin: jailbreak to fix build with latest version of 'lens'
haskell-json-assertions: jailbreak to fix build with latest version of 'lens'
haskell-src-exts: update to version 1.16.0.1
haskell-github-backup: update to version 1.20141031
haskell-extra: update to version 0.6
haskell-filestore: update to version 0.6.0.4
haskell-haskore: update to version 0.2.0.5
haskell-hspec-meta: update to version 1.12.2
haskell-hspec: update to version 1.12.2
haskell-semigroups: update to version 0.15.4
haskell-xml-html-conduit-lens: jailbreak to fix build with latest version of 'text'
haskell-mainland-pretty: jailbreak to fix build with latest version of 'text'
haskell-vcswrapper: jailbreak to fix build with latest version of 'text'