Hi all, When trying to install double-conversion, I'm getting the following errors. $ cabal install double-conversion Resolving dependencies... Warning: double-conversion.cabal: Ignoring unknown section type: test-suite Configuring double-conversion-0.2.0.3... cabal: Missing dependency on a foreign library: * Missing C library: stdc++ This problem can usually be solved by installing the system package that provides this library (you may need the "-dev" version). If the library is already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where it is. cabal: Error: some packages failed to install: double-conversion-0.2.0.3 failed during the configure step. The exception was: ExitFailure 1 So it seems to me that everything is in the expected place: the headers are in /usr/include/c++/4.* and the library itself is in /usr/lib. Explicitly forcing cabal to search these directories (with --extra-include-dirs and --extra-lib-dirs as suggested) doesn't help. Any ideas? version info: cabal-install version 0.8.0, using version 1.8.0.2 of the Cabal library, The Glorious Glasgow Haskell Compilation System, version 7.2.1 Thanks, Eric