Resolving dependencies...
Configuring hscolour-1.24.3...
Building hscolour-1.24.3...
Failed to install hscolour-1.24.3
Build log ( /home/builder/.cabal/logs/hscolour-1.24.3.log ):
cabal: Entering directory '/tmp/cabal-tmp-19178/hscolour-1.24.3'
Configuring hscolour-1.24.3...
Building hscolour-1.24.3...
Preprocessing library hscolour-1.24.3...
[ 1 of 16] Compiling Language.Haskell.HsColour.Output ( Language/Haskell/HsColour/Output.hs, dist/build/Language/Haskell/HsColour/Output.o )
[ 2 of 16] Compiling Language.Haskell.HsColour.Options ( Language/Haskell/HsColour/Options.hs, dist/build/Language/Haskell/HsColour/Options.o )

Language/Haskell/HsColour/Options.hs:11:9: warning: [-Wtabs]
    Tab character found here, and in 12 further locations.
    Please use spaces instead.
[ 3 of 16] Compiling Language.Haskell.HsColour.General ( Language/Haskell/HsColour/General.hs, dist/build/Language/Haskell/HsColour/General.o )
[ 4 of 16] Compiling Language.Haskell.HsColour.ColourHighlight ( Language/Haskell/HsColour/ColourHighlight.hs, dist/build/Language/Haskell/HsColour/ColourHighlight.o )
[ 5 of 16] Compiling Language.Haskell.HsColour.Classify ( Language/Haskell/HsColour/Classify.hs, dist/build/Language/Haskell/HsColour/Classify.o )

Language/Haskell/HsColour/Classify.hs:50:23: error:
    Not in scope: ‘Char.isUpper’
    No module named ‘Char’ is imported.
cabal: Leaving directory '/tmp/cabal-tmp-19178/hscolour-1.24.3'
cabal: Error: some packages failed to install:
hscolour-1.24.3 failed during the building phase. The exception was:
ExitFailure 1