Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building text-1.2.2.1...
Building mtl-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 scan-0.1.0.0...
Configuring scan-0.1.0.0...
Building scan-0.1.0.0...
Failed to install scan-0.1.0.0
Build log ( /home/builder/.cabal/logs/scan-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-24984/scan-0.1.0.0'
Configuring scan-0.1.0.0...
Building scan-0.1.0.0...
Preprocessing executable 'scan' for scan-0.1.0.0...
[1 of 1] Compiling Main             ( src/scan.hs, dist/build/scan/scan-tmp/Main.o )

src/scan.hs:24:1: error:
    Failed to load interface for ‘Language.Haskell.Scanner’
    Perhaps you meant
      Language.Haskell.TH.Ppr (needs flag -package-key template-haskell-2.11.0.0)
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-24984/scan-0.1.0.0'
cabal: Error: some packages failed to install:
scan-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1