Resolving dependencies...
Configuring transformers-compat-0.5.1.4...
Configuring ansi-terminal-0.6.2.3...
Building transformers-compat-0.5.1.4...
Building ansi-terminal-0.6.2.3...
Configuring text-1.2.2.1...
Installed transformers-compat-0.5.1.4
Building text-1.2.2.1...
Installed ansi-terminal-0.6.2.3
Configuring ansi-wl-pprint-0.6.7.3...
Building ansi-wl-pprint-0.6.7.3...
Installed ansi-wl-pprint-0.6.7.3
Configuring optparse-applicative-0.13.0.0...
Building optparse-applicative-0.13.0.0...
Installed optparse-applicative-0.13.0.0
Installed text-1.2.2.1
Configuring hills-0.1.0.0...
Building hills-0.1.0.0...
Failed to install hills-0.1.0.0
Build log ( /home/builder/.cabal/logs/hills-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-15093/hills-0.1.0.0'
Configuring hills-0.1.0.0...
Building hills-0.1.0.0...
Preprocessing executable 'hills' for hills-0.1.0.0...
[1 of 8] Compiling Stl              ( Stl.hs, dist/build/hills/hills-tmp/Stl.o )
[2 of 8] Compiling LatLong          ( LatLong.hs, dist/build/hills/hills-tmp/LatLong.o )
[3 of 8] Compiling Area             ( Area.hs, dist/build/hills/hills-tmp/Area.o )
[4 of 8] Compiling CGIAR            ( CGIAR.hs, dist/build/hills/hills-tmp/CGIAR.o )
[5 of 8] Compiling Topo             ( Topo.hs, dist/build/hills/hills-tmp/Topo.o )
[6 of 8] Compiling Model            ( Model.hs, dist/build/hills/hills-tmp/Model.o )
[7 of 8] Compiling Parse            ( Parse.hs, dist/build/hills/hills-tmp/Parse.o )

Parse.hs:7:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
[8 of 8] Compiling Main             ( Main.hs, dist/build/hills/hills-tmp/Main.o )

Main.hs:137:18: error:
    • Couldn't match expected type ‘ReadM FilePath’
                  with actual type ‘a0 -> Maybe a0’
    • Probable cause: ‘Just’ is applied to too few arguments
      In the first argument of ‘argument’, namely ‘Just’
      In the second argument of ‘(<*>)’, namely
        ‘argument Just (metavar "OUTFILE")’
      In the expression:
        Opts
        <$>
          option
            (eitherReader parseLatLongOpt)
            (short 'p'
             <>
               long "position"
               <> metavar "LAT,LONG" <> help "position (by default the centre)")
        <*>
          option
            (eitherReader parseSizeOpt)
            (short 'd'
             <>
               long "dimensions"
               <>
                 value (sizeFromSecs (300, 600))
                 <> metavar "ARCSECxARCSEC" <> help "size in arcseconds")
        <*>
          option
            (eitherReader parseOffsetOpt)
            (long "offset"
             <>
               value Nothing
               <>
                 metavar "ARCSEC,ARCSEC" <> help "offset from centre in arcseconds")
        <*>
          option
            auto
            (short 'b'
             <>
               long "base-altitude"
               <>
                 value ((- 100) :: Double)
                 <> metavar "METRES" <> help "base altitude")
        <*>
          option
            auto
            (short 's'
             <>
               long "scale"
               <> value 100 <> metavar "FACTOR" <> help "factor to scale down by")
        <*>
          option
            (eitherReader (Right . Just))
            (short 'i'
             <>
               long "input-dir"
               <>
                 value Nothing
                 <> metavar "DIR" <> help "directory with input files")
        <*> argument Just (metavar "OUTFILE")
cabal: Leaving directory '/tmp/cabal-tmp-15093/hills-0.1.0.0'
cabal: Error: some packages failed to install:
hills-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1