tracked here: [https://github.com/nim-lang/Nim/issues/10088](https://github.com/nim-lang/Nim/issues/10088) building from source on windows: instructions lack necessary details and lead to errors #10088
see [https://github.com/nim-lang/Nim/issues/10088#issuecomment-449787627](https://github.com/nim-lang/Nim/issues/10088#issuecomment-449787627) for the most reliable way I found, by simply patching %APPDATA%nimnim.cfg
