fastBPE | Neural Machine Translation of Rare Words | Natural Language Processing library

I am trying to make a transalation chatbot with the help of a github repository. Initial step is to install fastBPE package. When running "pip install fastBPE" command in terminal, I am getting following error:

I am trying to deploy a Python server to Heroku, and I need to execute a "g++" command on one of the libraries to install it on the server.

I want to create a gunicorn and Flask server hosting facebook's XLM model from cross-lingual model pretaining : https://github.com/facebookresearch/XLM

The model requires the "fastBPE" library (https://github.com/glample/fastBPE), which requires to be installed with the command : g++ -std=c++11 -pthread -O3 fastBPE/main.cc -IfastBPE -o fast

However, since the Heroku server is configured for Python, it doesn't recognize the "g++" command.

Here is what I tried so far : - adding the buildpack “heroku-buildpack-apt” in Heroku and creating an "Aptfile" in my source file, to write "g++" inside of it, as well as "build-essential" - inside the main python file, I create a subprocess to launch "apt-get install g++" :