I recently installed the aeson package using cabal-install without any trouble: ❲~❳ uname -rspi; cabal -V; ghc -V; ghc-pkg list | grep "aeson\|double-conversion" Linux 2.6.38-10-generic x86_64 x86_64 cabal-install version 0.10.2 using version 1.10.1.0 of the Cabal library The Glorious Glasgow Haskell Compilation System, version 7.0.3 aeson-0.3.2.9 double-conversion-0.2.0.1 However when I try to use it I receive this error message: λ> let f = Data.Aeson.String Loading package double-conversion-0.2.0.1 ... can't load .so/.DLL for: stdc++ (libstdc++.so: cannot open shared object file: No such file or directory) This is the version I have installed: ❲~❳ aptitude search stdc++ | grep ^i i libstdc++6 - The GNU Standard C++ Library v3 i A libstdc++6-4.4-dev - The GNU Standard C++ Library v3 (developme i libstdc++6-4.5-dev - The GNU Standard C++ Library v3 (developme ❲~❳ aptitude show libstdc++6-4.4-dev | head -n 4 Package: libstdc++6-4.4-dev State: installed Automatically installed: yes Version: 4.4.5-15ubuntu1