Hi,

You can update the command for ConTeXt as follows:

Graphically:

M-x customize-variable ↵

TeX-command-list ↵

find the appropriate section for ConTeXt commands and change it with (e.g.) "context --purgeall %t" (see attached image).

Apply and save.

-----------------------------

Using the init.el you can also create your own commands:

(custom-set-variables
   '(ConTeXt-Mark-version "lmtx")
   '(ConTeXt-engine "lmtx"))

(eval-after-load "context"
  '(setq TeX-command-list
    (append
      '(
        ("context"
"context --purgeall %t"
          TeX-run-command t :help "Run context (lmtx)")
        ("luametatex"
"context --purgeall %t"
          TeX-run-command t :help "Run context (lmtx)")
      ) TeX-command-list
    )
  )
  )

I hope this helps.

Lizardo R.