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 parsec3-1.0.1.8... Building parsec3-1.0.1.8... Installed parsec3-1.0.1.8 Configuring piki-0.5.1... Building piki-0.5.1... Failed to install piki-0.5.1 Build log ( /home/builder/.cabal/logs/piki-0.5.1.log ): cabal: Entering directory '/tmp/cabal-tmp-14393/piki-0.5.1' Configuring piki-0.5.1... Building piki-0.5.1... Preprocessing executable 'piki' for piki-0.5.1... [ 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-14393/piki-0.5.1' cabal: Error: some packages failed to install: piki-0.5.1 failed during the building phase. The exception was: ExitFailure 1