Yep, I had another installation of clang++ on my system, I changed the PATH and installed the MSVC clang tools
➜ defold git:(dev) which clang++
/c/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/Llvm/x64/bin/clang++
this is the which result now. The build process gives the same error so I’m guessing something is still missing ?