ensure instructions also work with opam >= 2.1
Closes frama-c#2667 (closed).
My tests seem to indicate this command succeeds both with opam 2.0 and 2.1, unlike opam install depext
, which only works with opam < 2.1, and whose error message (depext unmet availability conditions, e.g. 'opam-version >= "2.0.0~beta5" & opam-version < "2.1"') can lead users astray.
Edited by Allan Blanchard