To run the debugger without XEmacs, simply run SICStus Prolog from the directory with debugger.pl and type:
| ?- compile(debugger).This assumes that ale.pl and the debugger subdirectory are located in the same directory. If ALE.PL has not been loaded already, this will compile ale.pl as well. There will be a warning message about buffer-mode when it loads, which can be ignored. Then type:
| ?- noemacs.You can add a noemacs/0 directive to the end of debugger.pl to do this automatically.