In the end I had to delete the contents of the build folder whilst putting the path I found into the include.

I updated my iMAC yesterday to macOS Big Sur version 11.01 and now I've found that copy doesn't work in Finder and since copy doesn't work there is no paste option. The only place this does work is in a text box or terminal. What is the fix? I spent over an hour on the telephone to Apple support yesterday with no solution.