[go-nuts] Execute code before specific package init

Hello Gophers, here's my request :
I wrote a program A in its package main, which depends on a third-party
library B which I will *not* modify.
Dependency graph is thus :
  A -> B

Is there a way to execute some code *before* the initialization of package
B ?

Thank you for any clean (or dirty) ideas!
Full story here
<https://groups.google.com/forum/#!topic/google-appengine-go/ksryOEMor6c>