I'm sorry because this is a very elementary question but despite my attempts I can't seem to get cabal working for my project structure. I have two main source directories: src\haskell src\semanticdb Inside src\haskell I have main.hs with the module Main. Inside src\semanticdb I have semanticdb.hs with module OSIX.SemanticDB My cabal file contains the following 3 lines: main-is: main.hs hs-source-dirs: src/haskell src/semanticdb other-modules: OSIX.SemanticDB Then when I build with 'cabal build' I get the following error: cabal: can't find source for OSIX.SemanticDB in src/haskell, src/semanticdb, dist/build/autogen cabal --version gives: cabal-install version 0.6.4 using version 1.6.0.3 of the Cabal library I'd prefer to keep my directory structure as is if possible, but it doesn't seem to be working for me... Is there anything I can do or should I just restructure the directories? (NOTE: I'm using leksah as my IDE, so the cabal file is mostly generated automatically) Thanks, -Rehno