Resolving dependencies...
Configuring cereal-0.5.4.0...
Building cereal-0.5.4.0...
Installed cereal-0.5.4.0
Configuring messagepack-0.5.2...
Building messagepack-0.5.2...
Failed to install messagepack-0.5.2
Build log ( /home/builder/.cabal/logs/messagepack-0.5.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-29860/messagepack-0.5.2'
Configuring messagepack-0.5.2...
Building messagepack-0.5.2...
Preprocessing library messagepack-0.5.2...
[1 of 2] Compiling Data.MessagePack.Spec ( Data/MessagePack/Spec.hs, dist/build/Data/MessagePack/Spec.o )
[2 of 2] Compiling Data.MessagePack ( Data/MessagePack.hs, dist/build/Data/MessagePack.o )

Data/MessagePack.hs:103:31: error:
    • Variable not in scope: header2 :: PutM a0
    • Perhaps you meant ‘header’ (line 106)
cabal: Leaving directory '/tmp/cabal-tmp-29860/messagepack-0.5.2'
cabal: Error: some packages failed to install:
messagepack-0.5.2 failed during the building phase. The exception was:
ExitFailure 1