compile signature
compile signature

Note that it compiled fine on its own, but caused an issue
when a full <make xtest> was run, presumably due to interaction
with other overrides.

MasterDuke17/doc,perl6/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc,perl6/doc,perl6/doc,perl6/doc,perl6/doc,MasterDuke17/doc,MasterDuke17/doc,tbrowder/doc