[flext] "Undefined Symbol" when converting flext object to library

[Spencer Russell]

I've got a flext external working well as a single object, but I'd
like to add some more objects to create a library.

I think I'm following the example posed in lib1, but when I try to
instantiate my library in PD I get:
"undefined symbol: _ZN18flext_base_multi_d4InitEv"

I haven't dug very deeply into how the lib setup macros work, but any
thoughts as to where I would find the source of this problem?

Thanks,
Spencer