Duncan et al A few times recently I've tripped badly over this: * Cabal complains of missing dependencies * But the "missing" package is definitely installed Example below. The reason is: the "missing" package is installed for this user, but I didn't say "--user" when saying "setup configure". Confusingly, saying "cabal configure" works fine. But "cabal configure --global " fails with the missing dependency. So there are two infelicities, which combined to leave me stumped: 1. "setup configure" and "cabal configure" use different defaults. The former defaults to "--global" while the latter defaults to "--user". I suggest both default to --user. 2. The missing-package error message does not mention that it's looking only in the global packages. When (but only when) looking in the global packages only, the error should say: Setup: At least the following dependencies are missing: primitive ==0.3.* NB: setup is looking only in the globally-installed packages. If you want to include your per-user installed packages, use --user As a refinement, only suggest --user if that would actually resolve the problem. Simon ============= bash-3.2$ ./Setup configure --with-ghc=$head2 Configuring vector-0.6... Setup: At least the following dependencies are missing: primitive ==0.3.* bash-3.2$ ghc-pkg list ...blah... /home/simonpj/.ghc/x86_64-linux-6.13/package.conf.d: monads-tf-0.1.0.0 {parsec-3.0.0} primitive-0.3 transformers-0.2.1.0 vector-0.6 bash-3.2$