Created attachment 3000 [details]
Patch that solved the issue

Bake make the strong assumption that `python` is the binary used to launch it. This is usually the case but restrict usages such as

    $ python2 bake.py deploy

where /usr/bin/python is a simlink to the Python 3 interpretter. Thus not propagating my choice of using Python 2 to the waf calls when building NS-3.

Instead, builders such as WafModuleBuild or PythonModuleBuild should use `sys.executable` to reflect the choice of the user rather than arbitrarily forcing it.

Please find attached a patch applying such changes.