Currently I have the following directory structure:

src
-folder1
-folder2
-folder3
dub.sdl

How do I convince dub to compile files only from specific directory. I tried this, but it doesn't work, dub compiles everything in "src" folder.

configuration "library" {
    targetType "library"
    targetPath "lib"    
    sourceFiles "src/folder1"
}

configuration "benchmark" {
    targetType "executable"
    targetPath "bin"    
    sourceFiles "src/folder2"    
}

configuration "demo" {
    targetType "executable"
    targetPath "bin"    
    sourceFiles "src/folder3"    
}

I tried also excludeSourceFiles but this is not productive, I have a lot of folders and source files.