Method 'Bool' not found for invocant of class 'Integer'

OK: I get this message when running a .pir file from an embedded
parrot interpreter, but not when I actually call parrot from a command
line.  My guess is that there is perhaps a .pbc file missing from the
area where I have set up a runtime directory structure mimicking the
rakudo release, but I've tried copying everything over and I can't
seem to find what is present in the rakudo directory but not in the
one for my executable.  Is there some c method I can call to point a
parrot interpreter at a particular runtime directory -- like the same
one as rakudo/perl6 itself uses?

• Method 'Bool' not found for invocant of class 'Integer' by Nathaniel