[CMake] Can/should we specify optional dependencies

From: John Maddock (jz.maddock_at_[hidden])
Date: 2021-10-08 14:07:45

I have a regex bug report relating to linking to ICU when using CMake: 
https://github.com/boostorg/regex/issues/143

Is there a correct way to specify in the CMake file that if you use 
header X, then you should also link to library Y, but otherwise not?

Thanks, John.

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