Resolving dependencies...
Configuring utf8-string-0.3.7...
Building utf8-string-0.3.7...
Preprocessing library utf8-string-0.3.7...
[1 of 7] Compiling Codec.Binary.UTF8.String ( Codec/Binary/UTF8/String.hs, dist/build/Codec/Binary/UTF8/String.o )
[2 of 7] Compiling Codec.Binary.UTF8.Generic ( Codec/Binary/UTF8/Generic.hs, dist/build/Codec/Binary/UTF8/Generic.o )
[3 of 7] Compiling Data.String.UTF8 ( Data/String/UTF8.hs, dist/build/Data/String/UTF8.o )
[4 of 7] Compiling System.IO.UTF8   ( System/IO/UTF8.hs, dist/build/System/IO/UTF8.o )
[5 of 7] Compiling System.Environment.UTF8 ( System/Environment/UTF8.hs, dist/build/System/Environment/UTF8.o )
[6 of 7] Compiling Data.ByteString.UTF8 ( Data/ByteString/UTF8.hs, dist/build/Data/ByteString/UTF8.o )
[7 of 7] Compiling Data.ByteString.Lazy.UTF8 ( Data/ByteString/Lazy/UTF8.hs, dist/build/Data/ByteString/Lazy/UTF8.o )
In-place registering utf8-string-0.3.7...
Running Haddock for utf8-string-0.3.7...
Running hscolour for utf8-string-0.3.7...
Preprocessing library utf8-string-0.3.7...
Preprocessing library utf8-string-0.3.7...
Warning: The documentation for the following packages are not installed. No
links will be generated to these packages: rts-1.0
Haddock coverage:
 100% (  8 /  8) in 'Codec.Binary.UTF8.String'
  94% ( 16 / 17) in 'Codec.Binary.UTF8.Generic'
  89% ( 24 / 27) in 'Data.String.UTF8'
  82% ( 14 / 17) in 'System.IO.UTF8'
  14% (  1 /  7) in 'System.Environment.UTF8'
 100% ( 17 / 17) in 'Data.ByteString.UTF8'
 100% ( 17 / 17) in 'Data.ByteString.Lazy.UTF8'
Documentation created: dist/doc/html/utf8-string/index.html
Installing library in
/srv/hackage/var/build/tmp-install/lib/utf8-string-0.3.7/ghc-7.6.3
Registering utf8-string-0.3.7...
Installed utf8-string-0.3.7
Downloading UMM-0.3.1...
Configuring UMM-0.3.1...
Building UMM-0.3.1...
Preprocessing executable 'umm' for UMM-0.3.1...

UMMData.hs:32:8:
    Ambiguous module name `Prelude':
      it was found in multiple packages: base haskell98-2.0.0.2
Failed to install UMM-0.3.1
cabal: Error: some packages failed to install:
UMM-0.3.1 failed during the building phase. The exception was:
ExitFailure 1