Hello all I am trying to install Data.deriveTH . When i tried cabal install derive , i got this error. ntro@ntro-HP-dx2480-MT-NA121PA:~/Mukesh/assignment_haskell/work$ cabal install deriveResolving dependencies...<command line>: cannot satisfy -package Cabal-1.10.2.0: Cabal-1.10.2.0-072fce39d68f011c6a364057a3d15270 is unusable due to missing or recursive dependencies: containers-0.3.0.0-ee442470d8dcc9e45f31677c400c5379 (use -v for more information)cabal: Error: some packages failed to install:derive-2.5.4 depends on haskell-src-exts-1.11.1 which failed to install.haskell-src-exts-1.11.1 failed during the configure step. The exception was:ExitFailure 1 ntro@ntro-HP-dx2480-MT-NA121PA:~/Mukesh/assignment_haskell/work$ cabal install haskell-src-extsResolving dependencies...<command line>: cannot satisfy -package Cabal-1.10.2.0: Cabal-1.10.2.0-072fce39d68f011c6a364057a3d15270 is unusable due to missing or recursive dependencies: containers-0.3.0.0-ee442470d8dcc9e45f31677c400c5379 (use -v for more information)cabal: Error: some packages failed to install:haskell-src-exts-1.11.1 failed during the configure step. The exception was:ExitFailure 1 ntro@ntro-HP-dx2480-MT-NA121PA:~/Mukesh/assignment_haskell/work$ cabal install containersResolving dependencies...No packages to be installed. All the requested packages are already installed.If you want to reinstall anyway then use the --reinstall flag. I tried to resolve this issue on #haskell and i got suggestion that it was due to conflict in global and local namespace [ see here for more detail http://hpaste.org/51376 ]. One idea is i should wipe ~/.ghc and install all the libraries individually. Could some one please suggest if there is another idea to resolve this issue. Currently i have ghc-6.12.3 and installing ghc-7.0 will resolve the issue ? Thank you Mukesh Tiwari .