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I think D uses 3. You import a module in the source file, but if you need to include outside source files, then they would have to be listed when invoking the compiler. D also has a package system so that this isn't needed if you have sub-modules within a larger project.

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So sortof like the -I flag in c++ compilers?

Yes, but D also follows the convention of module names being mapped into the filesystem, or package name if it is a directory with a package.d file in it.

D also has the -I flag. Still needed for libraries in other folders.

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