Resolving dependencies... Downloading z3-0.2.0... Configuring z3-0.2.0... cabal: Missing dependency on a foreign library: * Missing (or bad) header file: z3.h * Missing C library: z3 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. If the header file does exist, it may contain errors that are caught by the C compiler at the preprocessing stage. In this case you can re-run configure with the verbosity flag -v3 to see the error messages. Failed to install z3-0.2.0 cabal: Error: some packages failed to install: z3-0.2.0 failed during the configure step. The exception was: ExitFailure 1