Hi list, I've got a number of modules in a project set up like this: project |-- foo |-- bar |-- baz `-- sandbox where 'foo', 'bar' and 'baz' are modules which depend on one another, and 'sandbox' is a sandbox. Before building from scratch, I do a $(cabal sandbox init --sandbox=../sandbox) in each of the module folders. If I run $(cabal install ./foo ./bar ./baz) from the projects/ directory, everything is happy. However, if I reconfigure one of the sub-modules with different flags, it fails with missing dependencies: # in foo/ $ cabal build Package has never been configured. Configuring with default flags. If this fails, please run configure manually. # module builds correctly $ cabal configure --enable-tests Resolving dependencies... Configuring foo-0.1... $ cabal build dist/setup/setup.hs:13:8: Could not find module ‘System.FilePath.Glob’ Perhaps you meant System.FilePath (from filepath-1.3.0.2) System.FilePath.Posix (from filepath-1.3.0.2) Use -v to see a list of the files searched for. Glob is installed in the sandbox. I've tried pointing to the sandbox config file manually with both $(cabal --sandbox-config-file=project/foo/cabal.sandbox.config) and $(cabal --sandbox-config-file=project/cabal.sandbox.config) with the same result. Cabal insists that Glob isn't installed until I nuke the foo/dist directory and start over. I figure there's some flag I need to pass to `cabal configure` that I'm missing, but I can't figure out what it is. Anybody have any hints? Cheers, Alex