Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Configuring tokyocabinet-haskell-0.0.1...
Building tokyocabinet-haskell-0.0.1...
Failed to install tokyocabinet-haskell-0.0.1
Build log ( /home/builder/.cabal/logs/tokyocabinet-haskell-0.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-25491/tokyocabinet-haskell-0.0.1'
Configuring tokyocabinet-haskell-0.0.1...
Building tokyocabinet-haskell-0.0.1...
Preprocessing library tokyocabinet-haskell-0.0.1...

Database/TokyoCabinet/List/C.hs:1:12: warning:
    -#include and INCLUDE pragmas are deprecated: They no longer have any effect
[ 1 of 15] Compiling Database.TokyoCabinet.Storable ( Database/TokyoCabinet/Storable.hs, dist/build/Database/TokyoCabinet/Storable.o )
[ 2 of 15] Compiling Database.TokyoCabinet.List.C ( Database/TokyoCabinet/List/C.hs, dist/build/Database/TokyoCabinet/List/C.o )
[ 3 of 15] Compiling Database.TokyoCabinet.List ( Database/TokyoCabinet/List.hs, dist/build/Database/TokyoCabinet/List.o )
[ 4 of 15] Compiling Database.TokyoCabinet.Internal ( Database/TokyoCabinet/Internal.hs, dist/build/Database/TokyoCabinet/Internal.o )
[ 5 of 15] Compiling Database.TokyoCabinet.HDB.C ( dist/build/Database/TokyoCabinet/HDB/C.hs, dist/build/Database/TokyoCabinet/HDB/C.o )
[ 6 of 15] Compiling Database.TokyoCabinet.FDB.C ( dist/build/Database/TokyoCabinet/FDB/C.hs, dist/build/Database/TokyoCabinet/FDB/C.o )
[ 7 of 15] Compiling Database.TokyoCabinet.FDB.Key ( Database/TokyoCabinet/FDB/Key.hs, dist/build/Database/TokyoCabinet/FDB/Key.o )

Database/TokyoCabinet/FDB/Key.hs:53:10: error:
    • Illegal instance declaration for ‘Key String’
        (All instance types must be of the form (T a1 ... an)
         where a1 ... an are *distinct type variables*,
         and each type variable appears at most once in the instance head.
         Use FlexibleInstances if you want to disable this.)
    • In the instance declaration for ‘Key String’
cabal: Leaving directory '/tmp/cabal-tmp-25491/tokyocabinet-haskell-0.0.1'
cabal: Error: some packages failed to install:
tokyocabinet-haskell-0.0.1 failed during the building phase. The exception
was:
ExitFailure 1