zlib linking error with 3.2 (not with 3.0)

I am trying to port an old project from wxWidgets 3.0 to 3.2.

I had the usual amount of small problems but it was easy to fix them, 
then I was able to compile under Windows.

Now I am getting  linker errors and I need some help to fix them. Here 
are the errors:

5>exiv2sd.lib(pngchunk.obj) : error LNK2019: unresolved external symbol 
_uncompress referenced in function "private: static void __cdecl 
Exiv2::Internal::PngChunk::zlibUncompress(unsigned char const *,unsigned 
int,class Exiv2::DataBuf &)" 
(?zlibUncompress@PngChunk@Internal@Exiv2@@CAXPBEIAAVDataBuf@3@@Z)
5>exiv2sd.lib(pngchunk.obj) : error LNK2019: unresolved external symbol 
_compress2 referenced in function "private: static class 
std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> > __cdecl 
Exiv2::Internal::PngChunk::zlibCompress(class 
std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> > const &)" 
(?zlibCompress@PngChunk@Internal@Exiv2@@CA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV45@@Z)
5>exiv2sd.lib(pngchunk.obj) : error LNK2019: unresolved external symbol 
_crc32 referenced in function "private: static class 
std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> > __cdecl 
Exiv2::Internal::PngChunk::makeAsciiTxtChunk(class 
std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> > const &,class std::basic_string<char,struct 
std::char_traits<char>,class std::allocator<char> > const &,bool)" 
(?makeAsciiTxtChunk@PngChunk@Internal@Exiv2@@CA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV45@0_N@Z)

The errors come from a statically linked Exiv2 library. It looks like 
the linker cannot find some symbols that come from zlib.

I made some tests and if I build the program against wxWidgets 3.0.2 
everything works and the program links correctly.

If I build against wxWidgets version 3.1.1 o later I get those linker 
errors.

It looks like from 3.1 something has changed and the zlib copy included 
in wxWidgets is no more accessible.

Does anybody know how to fix this problem?

Thanks in advance.

Fulvio Senore

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