The sTeX repository still has to be added to the TEXINPUTS.
You can do this by adding the following line to your ~/.profile file:
where /path/to/sTeX should be the path to the cloned sTeX repository.
The SMGloM contents are kept in GitLab Repositories as Math Archives: Each repository has a source subfolder, which contains the sTeX files for a SMGloM Module. These come in two varieties:
sTeX Module Signatures:
sTeX Language Bindings:
To contribute to existing SMGloM repositories, the best way is to create pull requests. If you plan extended development of SMGloM content, you should establish your own repository. For the latter, just contact email@example.com.
Generating PDF (the elementary way)
The best way to prototype SMGloM content is to use pdflatex. BUT, SMGloM modules are just file fragments, you cannot directly run pdflatex on your module foo.en.tex. Instead you want to make a file