On Tue, Aug 15, 2017 at 3:48 PM Elliott Slaughter <
elliottslaughter@gmail.com> wrote:

> Actually, the backtrace goes through the el-get loaddefs file, so maybe
> something is going wrong there. Let me check with the el-get developers and
> see if they know what is going on.
>

Yes, that's very likely. I have been building Org from master branch and it
has been working fine.

C-h v org-src-lang-modes tells that it is defined in org-src.el.

So you probably have a mixed installation where an old org-src.el is loaded
which doesn't have that variable defined.

(I had recently written about how to install the development version of Org
without causing mixed installations:
https://scripter.co/building-org-development-version/ .)

-- 

Kaushal Modi