File psl-1983/3-1/util/if-system.red from the latest check-in
% % IF-SYSTEM.RED - Conditional compilation for system-dependent code % % Author: Eric Benson % Symbolic Computation Group % Computer Science Dept. % University of Utah % Date: 10 March 1982 % Copyright (c) 1982 University of Utah % fluid '(system_list!*); macro procedure if_system U; do_if_system(cadr U, caddr U, if cdddr U then cadddr U else NIL); expr procedure do_if_system(system_name, true_case, false_case); if system_name memq system_list!* then true_case else false_case; END;