Two pyCRTM Installation Warnings

I’m trying to install pyCRTM on my linux machine using the command “python3 install”. After many lines scrolled by I got the following two warnings:

WARN: Could not locate executable armflang
WARN: arm: no Fortran 77 compiler found

The two warnings are obviously specific, but I’m not sure where on my system or in the code to fix this. Any thoughts?