PCL LNK2001 unresolved external symbol EuclideanClusterExtraction extract()

I have been getting the following linker error when building with the Point Cloud Library (PCL 1.8.1) in Visual Studio 2017 – not at all sure why:

I found that to get rid of the linker error I needed to include:

Again I am not sure why, and it is not usual to have to include impl/* files? – I may look into it a bit further if I get a chance but for now I am happy that my code links!

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