Resolving dependencies... Configuring vrpn-0.2.1.4... Failed to install vrpn-0.2.1.4 Build log ( /home/builder/.cabal/logs/vrpn-0.2.1.4.log ): cabal: Entering directory '/tmp/cabal-tmp-4430/vrpn-0.2.1.4' Configuring vrpn-0.2.1.4... cabal: Missing dependencies on foreign libraries: * Missing C libraries: vrpn, vrpn This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are. cabal: Leaving directory '/tmp/cabal-tmp-4430/vrpn-0.2.1.4' cabal: Error: some packages failed to install: vrpn-0.2.1.4 failed during the configure step. The exception was: ExitFailure 1