Question

I can change prompt_alternatives_on flag in the REPL.

1. But how do I change this flag in .plrc?

Then I get

 permission to modify static_procedure `set_prolog_flag/2' 

Goal: To not get the ‘More?’ text for all the answers all the time. By changing the flag.

Answer 1

Put :- (a colon and a hypen) in front of the line to execute it when the file is loaded.

:- set_prolog_flag(key, value). 

This is true of any line of code in any source file that you want to have evaluated when the file is loaded instead of considered a new fact or rule (which causes the error because it attempts to redefine set_prolog_flag/2).