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Configuring clash-lib-0.6.21...
Building clash-lib-0.6.21...
Failed to install clash-lib-0.6.21
Build log ( /home/builder/.cabal/logs/clash-lib-0.6.21.log ):
cabal: Entering directory '/tmp/cabal-tmp-576/clash-lib-0.6.21'
Configuring clash-lib-0.6.21...
Building clash-lib-0.6.21...
Preprocessing library clash-lib-0.6.21...
[ 1 of 45] Compiling Unbound.Generics.LocallyNameless.Extra ( src/Unbound/Generics/LocallyNameless/Extra.hs, dist/build/Unbound/Generics/LocallyNameless/Extra.o )
[ 2 of 45] Compiling Paths_clash_lib  ( dist/build/autogen/Paths_clash_lib.hs, dist/build/Paths_clash_lib.o )
[ 3 of 45] Compiling GHC.Extra        ( src/GHC/Extra.hs, dist/build/GHC/Extra.o )

src/GHC/Extra.hs:14:10: error:
    Duplicate instance declarations:
      instance NFData SrcSpan -- Defined at src/GHC/Extra.hs:14:10
      instance NFData SrcSpan -- Defined in ‘SrcLoc’
cabal: Leaving directory '/tmp/cabal-tmp-576/clash-lib-0.6.21'
cabal: Error: some packages failed to install:
clash-lib-0.6.21 failed during the building phase. The exception was:
ExitFailure 1
clash-vhdl-0.6.8 depends on clash-lib-0.6.21 which failed to install.