Yes linking both d and non -d was an act of frustration → I fixed that
Yes I restarted the machine after editing the PATH variable.
What got me confused it in the tutorial it looks like three options to install:
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Installation by Using the Pre-built Libraries
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Installation by Using git-bash and cmake
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Installation by Making Your Own Libraries from the Source Files
I went for 1) because it looked straight forward and simple and was matching the tutorial I linked in my first post.
But anyhow, I followed your recommendation and followed the "Installation by Using git-bash and cmake tutorial…
But instead of step 8 of the tutorial: “Drink a coffee or two…” I called it a day.
New day new happiness - at this point the tutorial isn’t really much help anymore because it’s referring to another version. But I thought I figured it out - fixed the file paths because they slightly changed…
and… it works 
thank’s to @crackwitz