sbffi can't build during install.

[Pomax]

D:\temp\node_test>npm install sbffi
npm ERR! code 1
npm ERR! path D:\temp\node_test\node_modules\sbffi
npm ERR! command failed
npm ERR! command C:\Windows\system32\cmd.exe /d /s /c prebuild-install -t 5 -r napi || npm run build
npm ERR! > [email protected] build
npm ERR! > prebuild -t 5 -r napi --backend cmake-js
npm ERR! 'prebuild' is not recognized as an internal or external command,
npm ERR! operable program or batch file.