🚀 go-pugleaf

Let me explain by an example what I'm looking for.  I want to write a
program that works for both SICStus Prolog and Sepia.  The problem is
that I need to retract all clauses foo/n when the program is started.
Now, in SICStus the procedure is called retractall/2, but in Sepia it
is retract_all/2.  That extra underscore (or absence of it) is really 
annoying!  So I'd like to hear about efficient and portable tricks to
write code that works in both languages.

	Should I use call/1?  

	Should I write "retractall(H) :- retract_all(H)." and rely
	on the fact that SICStus just issues a warning when an
	a built-in predicate is being redefined?

	Any better ideas?

--Kjell	kjell@cs.ucsc.edu