Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Configuring BNFC-2.6.0.0...
Building BNFC-2.6.0.0...
Failed to install BNFC-2.6.0.0
Build log ( /home/builder/.cabal/logs/BNFC-2.6.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-9187/BNFC-2.6.0.0'
Configuring BNFC-2.6.0.0...
Building BNFC-2.6.0.0...
Preprocessing library BNFC-2.6.0.0...
[1 of 5] Compiling Data.Pair        ( src/Data/Pair.hs, dist/build/Data/Pair.o )
[2 of 5] Compiling Algebra.RingUtils ( runtime/Algebra/RingUtils.hs, dist/build/Algebra/RingUtils.o )
[3 of 5] Compiling Data.Matrix.Quad ( runtime/Data/Matrix/Quad.hs, dist/build/Data/Matrix/Quad.o )

runtime/Data/Matrix/Quad.hs:79:3: warning: [-Woverlapping-patterns]
    Pattern match is redundant
    In an equation for ‘&’: & x y = ...
[4 of 5] Compiling Parsing.Chart    ( runtime/Parsing/Chart.hs, dist/build/Parsing/Chart.o )

runtime/Parsing/Chart.hs:15:1: error:
    Failed to load interface for ‘Data.Matrix.Class’
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-9187/BNFC-2.6.0.0'
cabal: Error: some packages failed to install:
BNFC-2.6.0.0 failed during the building phase. The exception was:
ExitFailure 1