Resolving dependencies...
Configuring PDBtools-0.0.2...
Building PDBtools-0.0.2...
Failed to install PDBtools-0.0.2
Build log ( /home/builder/.cabal/logs/PDBtools-0.0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-30536/PDBtools-0.0.2'
Configuring PDBtools-0.0.2...
Building PDBtools-0.0.2...
Preprocessing library PDBtools-0.0.2...
[1 of 4] Compiling PDButil.Vectors  ( PDButil/Vectors.hs, dist/build/PDButil/Vectors.o )

PDButil/Vectors.hs:36:11: error:
    • Could not deduce (Eq a) arising from a use of ‘==’
      from the context: Floating a
        bound by the type signature for:
                   angle :: Floating a => [a] -> [a] -> a
        at PDButil/Vectors.hs:34:1-40
      Possible fix:
        add (Eq a) to the context of
          the type signature for:
            angle :: Floating a => [a] -> [a] -> a
    • In the first argument of ‘(||)’, namely ‘norm a == 0’
      In the expression: norm a == 0 || norm b == 0
      In a stmt of a pattern guard for
                     an equation for ‘angle’:
        norm a == 0 || norm b == 0
cabal: Leaving directory '/tmp/cabal-tmp-30536/PDBtools-0.0.2'
cabal: Error: some packages failed to install:
PDBtools-0.0.2 failed during the building phase. The exception was:
ExitFailure 1