Defining a macro for longtable environment using emacs/AUCTeX

[Peter Flynn]

On 31/03/2019 15:01, Frank Grellert wrote:
> I couldn't find longtable among the AUCTeX-environment variables. 

Perhaps AUCTeX isn't set up to use longtable (I don't know: I never use it).

> Thus I wouldlike to define my own (similar to the way you can define
> macros withn TeXShop).
> 
> Any hints?

Don't. If you don't already have longtable, install it using the TeX 
Live package manager, and use it.

Peter