ERROR: Failed to build gem native extension.

'nmake' is not recognized as an internal or external command,
operable program or batch file.

Appears you don't have a build environment installed, and that amatch
doesn't give you any binaries, need a build
environment :slight_smile:
As alpha Blue noted, the easiest way is to download/install mingw +
devkit [devkit is mingw compiler] and hope it builds at that point, or
switch to linux or cygwin [or drop that extension].