Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Downloading fitsio-0.1...
Configuring fitsio-0.1...
Building fitsio-0.1...
Failed to install fitsio-0.1
Build log ( /home/builder/.cabal/logs/fitsio-0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-15015/fitsio-0.1'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-15015/fitsio-0.1/dist/setup/setup.hs, /tmp/cabal-tmp-15015/fitsio-0.1/dist/setup/Main.o )
Linking /tmp/cabal-tmp-15015/fitsio-0.1/dist/setup/setup ...
Configuring fitsio-0.1...
Warning: No 'build-type' specified. If you do not need a custom Setup.hs or
./configure script then use 'build-type: Simple'.
Warning: Instead of 'ghc-options: -ffi' use 'extensions:
ForeignFunctionInterface'
Warning: Instead of 'ghc-options: -lcfitsio' use 'extra-libraries: cfitsio'
Building fitsio-0.1...
Preprocessing library fitsio-0.1...

on the commandline: warning:
    -ffi is deprecated: use -XForeignFunctionInterface or pragma {-# LANGUAGE ForeignFunctionInterface #-} instead
[1 of 1] Compiling FitsIO           ( dist/build/FitsIO.hs, dist/build/FitsIO.o )

src/FitsIO.chs:14:1: error:
    Failed to load interface for ‘C2HS’
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-15015/fitsio-0.1'
cabal: Error: some packages failed to install:
fitsio-0.1 failed during the building phase. The exception was:
ExitFailure 1