One arguably more elegant way would be with the if pragma. The documentation even uses this specific case (yes/no MSWin32) as the first example.

Another could be Module::Load which can be used for run-time decisions (as opposed to compile-time) and might therefore be better suited to more general cases.

In reply to Re^3: Easing cross-platform scripting (conditional module loading) by hippo
in thread Easing cross-platform scripting by White Raven

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