Show how to call a function in a shared library (without dynamically linking to it at compile-time). In particular, show how to call the shared library function if the library is available, otherwise use an internal equivalent function.

This is a special case of [[Call foreign language function|calling a foreign language function]] where the focus is close to the ABI level and not at the normal API level.


;Related task:
* [[OpenGL]] -- OpenGL is usually maintained as a shared library.
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