Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building mtl-2.2.1...
Building text-1.2.2.1...
Installed mtl-2.2.1
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Downloading piki-0.5.2...
Configuring piki-0.5.2...
Building piki-0.5.2...
Failed to install piki-0.5.2
Build log ( /home/builder/.cabal/logs/piki-0.5.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-11046/piki-0.5.2'
Configuring piki-0.5.2...
Building piki-0.5.2...
Preprocessing executable 'piki' for piki-0.5.2...
[ 1 of 10] Compiling Types            ( src/Types.hs, dist/build/piki/piki-tmp/Types.o )
[ 2 of 10] Compiling Parsec           ( src/Parsec.hs, dist/build/piki/piki-tmp/Parsec.o )

src/Parsec.hs:20:10: error:
    Duplicate instance declarations:
      instance Monad m => Stream L.Text m Char
        -- Defined at src/Parsec.hs:20:10
      instance [safe] Monad m => Stream L.Text m Char
        -- Defined in ‘Text.Parsec.Prim’
cabal: Leaving directory '/tmp/cabal-tmp-11046/piki-0.5.2'
cabal: Error: some packages failed to install:
piki-0.5.2 failed during the building phase. The exception was:
ExitFailure 1