Don't #include source modules. Add your source module to your project. Then, include your header module into your source module. Any modules outside the project are ignored.
To add a file to a project in Visual C++:
1) Right-click the solution.
2) Click Add then Existing Item.
2) Find your module.
To add a file to a project in Code::Blocks:
1) Right-click the project name (under Workspace).
2) Click Add Files.
3) Find your module.