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Configuring chart-unit-0.5.0...
Building chart-unit-0.5.0...
Failed to install chart-unit-0.5.0
Build log ( /home/builder/.cabal/logs/chart-unit-0.5.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-12852/chart-unit-0.5.0'
Configuring chart-unit-0.5.0...
Building chart-unit-0.5.0...
Preprocessing library chart-unit-0.5.0...
[1 of 9] Compiling Chart.Core       ( src/Chart/Core.hs, dist/build/Chart/Core.o )
[2 of 9] Compiling Chart.Rect       ( src/Chart/Rect.hs, dist/build/Chart/Rect.o )

src/Chart/Rect.hs:63:47: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Diagrams.Prelude.<>’,
                             imported from ‘Diagrams.Prelude’ at src/Chart/Rect.hs:32:1-57
                             (and originally defined in ‘Data.Semigroup’)
                          or ‘NumHask.Prelude.<>’,
                             imported from ‘NumHask.Prelude’ at src/Chart/Rect.hs:34:1-22
                             (and originally defined in ‘Data.Monoid’)
cabal: Leaving directory '/tmp/cabal-tmp-12852/chart-unit-0.5.0'
cabal: Error: some packages failed to install:
chart-unit-0.5.0 failed during the building phase. The exception was:
ExitFailure 1