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Link Error: Undefined symbols: typeinfo for ... in XCode 2.0



I'm trying to (re)build a C++ application in XCode 2.0 that was compiling and linking just fine in XCode 1.5 and get the following linker error message:
 
...
Undefined symbols:
   typeinfo for PWR_CApplication
   typeinfo for PWR_CWindow
   collect2: id returned 1 exit status
Build failed...
 
The symbols PWR_CApplication and PWR_CWindow are C++ classes that (at least) when compiled with XCOde 1.5 seem to exist in a 3rd party library I'm including as a framework and collect2 does not show up as a symbol in any of the files of my project.
 
1) Has someone an idea what the source of this problem might be or what to look for?
2) Should a framework that did work together with XCode 1.5 also work with XCode 2.0?
3) Can XCode 2.0 and 1.5 run on the same hardware without to many problems?
4) Can I actually use XCode 1.5 under Tiger?
5) Is it generally adviced to use XCode 2.0 or is it just to new?
 
Any help is really appreciated.
 
Cheers,
 
-Dieter
 
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