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Reading the repository you mentioned (https://github.com/diracdeltas/vstSpleeter), I noticed that they require you to install and build some dependencies first. From the sound of that missing file error, I think it's possible you didn't do that as they intended. While I haven't delved deeply into it, it seems that the spleeter VST requires the regular spleeter to be installed in order to build correctly, which might be an indication of why it can't find "spleeter_filter/filter.h".
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