Please help to solve a problem installing curl package ( http://hackage.haskell.org/package/curl/) on Debian 6.0.5. I am running the most recent Debian Haskell platform with GHC 6.12.1. I did: -> cabal update -> cabal install cabal-install It is interesting that in case you do again 'cabal update" you again get a suggestion from cabal to upgrade cabal-install, and this process never ends: """ -> cabal update Downloading the latest package list from hackage.haskell.org Note: there is a new version of cabal-install available. To upgrade, run: cabal install cabal-install """ Anyway, then I did: -> apt-get install curl -> cabal install curl Cabal fails to install 'curl' because it can not find curl library. Please see detailed cabal output at the end of this message. So my questions: 1) What is missing to install curl package? 2) Should I upgrade Debian GHC 6.12.1 to the latest GHC 7.4.2? Maybe this should solve the problem with 'cabal install'? Thanks! ---------- cabal install output ---------- -> cabal install curl Resolving dependencies... Configuring curl-1.3.7... checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking how to run the C preprocessor... gcc -E configure: error: curl libraries not found, so curl package cannot be built See `config.log' for more details. cabal: Error: some packages failed to install: curl-1.3.7 failed during the configure step. The exception was: ExitFailure 1