This does look great! Unfortunately it looks like it'll be hard for me to build it; it's yet another project that got fucked over by the Python community's irresponsibility.
* Duktape python tooling is obsolete, migrate to JS-based tooling! *
$ python2 duktape-2.6.0/tools/configure.py --output-directory src-duktape \
-UDUK_USE_ES6_PROXY
I'm glad to hear my impression that there was no other build system was wrong!