Resolving dependencies...
Configuring mtl-2.2.1...
Configuring readline-1.0.3.0...
Building mtl-2.2.1...
Building readline-1.0.3.0...
Installed mtl-2.2.1
Installed readline-1.0.3.0
Configuring djinn-2008.1.18...
Building djinn-2008.1.18...
Failed to install djinn-2008.1.18
Build log ( /home/builder/.cabal/logs/djinn-2008.1.18.log ):
cabal: Entering directory '/tmp/cabal-tmp-10762/djinn-2008.1.18'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-10762/djinn-2008.1.18/dist/setup/setup.hs, /tmp/cabal-tmp-10762/djinn-2008.1.18/dist/setup/Main.o )
Linking /tmp/cabal-tmp-10762/djinn-2008.1.18/dist/setup/setup ...
Configuring djinn-2008.1.18...
Warning: No 'build-type' specified. If you do not need a custom Setup.hs or
./configure script then use 'build-type: Simple'.
Warning: 'ghc-options: -prof' is not necessary and will lead to problems when
used on a library. Use the configure flag --enable-library-profiling and/or
--enable-profiling.
Building djinn-2008.1.18...
Preprocessing executable 'djinn' for djinn-2008.1.18...
[1 of 9] Compiling Util.Sort        ( Djinn/Util/Sort.hs, dist/build/djinn/djinn-tmp/Util/Sort.o )

Djinn/Util/Sort.hs:16:28: warning: [-Wtabs]
    Tab character found here, and in 33 further locations.
    Please use spaces instead.

<no location info>: error: 
Failing due to -Werror.
cabal: Leaving directory '/tmp/cabal-tmp-10762/djinn-2008.1.18'
cabal: Error: some packages failed to install:
djinn-2008.1.18 failed during the building phase. The exception was:
ExitFailure 1