Gwrapguile also has some self tests that show up the bug, but doesn't runthem at build time. Boo gwrapguile. This should be fixed, hopefully thecontrol commands above should remind Monsieur Goerzen to do so sometime.
FWIW, James Treacy is now maintaing gnucash and gwrapguile. I'm not sure if he is aware of the history of this bug but he should have gotten the mail via the packages.d.o address. Not sure why I got it.