[PD] compiling CVS externals in os x

[Thomas Grill]

> I think you can turn these warnings off with -Wno-shadow. Whether doing
> such a thing is actually harmful, I don't know, but I've blithely ignored
> those errors for months, now. :)

-Wshadow is great for detecting (especially c++) programming faults, on the
other hand, if you know that the code works on one platform it's just ok to
blindly use -Wno-shadow.

greetings,
Thomas