Problem reading iterator values from a set

I am porting some windows C++ code to solaris. The following line of code compiles and works on the windows maching, but not the solaris machine.

I get the following error message:
error: invalid initialization of reference of type 'std::set<std::wstring, std::less<std::wstring>, std::allocator<std::wstring> >&' from expression of type 'const std::set<std::wstring, std::less<std::wstring>, std::allocator<std::wstring> >'

Can anyone shed some light on this? I don't see what the problem is.

set< pair< long,set<wstring> > >::iterator itSet1;
set<wstring> &tempSet = (*itSet1).second;

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Make that

const set<wstring> &tempSet = (*itSet1).second;

and you should be fine (according to the error message).
... or, alternatively

set<wstring> &tempSet = const_cast<set<wstring> >((*itSet1).second);

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