Resolving dependencies... Downloading libpq-0.1... Configuring libpq-0.1... Building libpq-0.1... Preprocessing library libpq-0.1... PQ.hsc:140:22: fatal error: libpq-fe.h: No such file or directory compilation terminated. compiling dist/build/Database/PQ_hsc_make.c failed (exit code 1) command was: /usr/bin/gcc -c dist/build/Database/PQ_hsc_make.c -o dist/build/Database/PQ_hsc_make.o -fno-stack-protector -Wl,--hash-size=31 -Wl,--reduce-memory-overheads -D__GLASGOW_HASKELL__=706 -Dlinux_BUILD_OS=1 -Dx86_64_BUILD_ARCH=1 -Dlinux_HOST_OS=1 -Dx86_64_HOST_ARCH=1 -I/usr/local/lib/ghc-7.6.3/unix-2.6.0.1/include -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/lib/ghc-7.6.3/time-1.4.0.1/include -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/lib/ghc-7.6.3/bytestring-0.10.0.2/include -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/lib/ghc-7.6.3/base-4.6.0.1/include -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/lib/ghc-7.6.3/include -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/lib/ghc-7.6.3/include/ Failed to install libpq-0.1 cabal: Error: some packages failed to install: libpq-0.1 failed during the building phase. The exception was: ExitFailure 1