[vtkusers] Compilation Errors error: ISO C++ says that these are ambiguous, even though the worst convesion for the first is better than theworst conversion for the second

[Luca Pallozzi Lavorante]

Hi everybody, sorry for bothering you.
I am trying to compile VTK 4.2 on Fedora and got the error in the 
subject (file ./IO/vtkBMPReader.cxx). Does anybody  know how to solve 
the problem?
Which cmake option should be modified?
I have searched on the list and google and only found one post with no 
reply.

    Thank you in advance

   Luca Pallozzi Lavorante