mbstate_t compile problem

[ROD CHRISTOPHERS]

Hi,

Please can someone help with the following issues I am having:

I have some code which I am trying to port to to an AIX box and I am
getting the infamous 'mbstate_t has not been declared error'.

I upgraded the gcc version to 4.0.4 on my linux box and  I have no
problems there.
However when I attempt to deploy the application to the AIX box
running gcc version 4.0.0 I get the mbstate_t error mentioned above.

I have tried numerous solutions I have found on the net but none have
fixed the issue.

What I'd like to know is why is this only occuring on the AIX system?
Is there a simple way to fix this issue by upgrading the gcc compiler
on the AIX box or by applying a patch?
If not can someone please point me to a viable solution?

Kind Regards
Rod


//----- Beginning of the compiler output
sapuat /home/mqappl/PostLink-Put >>g++ -c -g ISSException.cpp -o
ISSException.o
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/wchar.h:
299: error: 'mbstate_t' has not been declared
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/wchar.h:
302: error: 'mbstate_t' has not been declared
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/c++/cwchar:
71: error: '::mbstate_t' has not been declared
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/c++/cwchar:
145: error: '::btowc' has not been declared
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/c++/cwchar:
150: error: '::fwide' has not been declared
/opt/freeware/lib/gcc/powerpc-ibm-aix5.1.0.0/4.0.0/include/c++/cwchar:
151: error: '::fwprintf' has not been declared