Also, that error with winnus - did it actually stop you from running it? Usually the build fails but it's an optional dependency, so everything should still work.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Did you try enabling the experimental flags? http://www.espruino.com/Web+Bluetooth+On+Linux
Also, that error with winnus - did it actually stop you from running it? Usually the build fails but it's an optional dependency, so everything should still work.