org-latex-custom-lang-environments

org-latex-custom-lang-environments is a variable defined in `ox-latex.el'.
Its value is

nil

Documentation:
Alist mapping languages to language-specific LaTeX environments.

It is used during export of src blocks by the listings and minted
latex packages. For example,

(setq org-latex-custom-lang-environments
'((python "pythoncode")))

would have the effect that if org encounters begin_src python
during latex export it will output

\begin{pythoncode}

\end{pythoncode}