Ok, after a bit of testing it seems the reason was because I had Python 3 installed prior to installing Emscripten.
A warning on the webpage not to have python installed would be nice. -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
