Resolving dependencies... [1 of 1] Compiling Main ( /tmp/cabal-tmp-31780/typeof-0.1/dist/setup/setup.hs, /tmp/cabal-tmp-31780/typeof-0.1/dist/setup/Main.o ) Linking /tmp/cabal-tmp-31780/typeof-0.1/dist/setup/setup ... Configuring typeof-0.1... Warning: No 'build-type' specified. If you do not need a custom Setup.hs or ./configure script then use 'build-type: Simple'. Warning: The 'license-file' field refers to the file 'LICENSE' which does not exist. Building typeof-0.1... Preprocessing executable 'typeof' for typeof-0.1... Process.hs:18:8: Could not find module ‘System.Process’ It is a member of the hidden package ‘process-1.2.3.0@proce_FLTz0SLwyG6LJUpZ52HjkU’. Perhaps you need to add ‘process’ to the build-depends in your .cabal file. Use -v to see a list of the files searched for. Failed to install typeof-0.1 cabal: Error: some packages failed to install: typeof-0.1 failed during the building phase. The exception was: ExitFailure 1