Solaris compile error

I am trying to build matplotlib on Solaris and am getting the following
compile error. Does this look familiar to anyone?

thanks,
S

In file included from
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/bits/postypes.h:4\
6,
                 from
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/iosfwd:50,
                 from
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/ios:44,
                 from
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/ostream:45,
                 from
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/iostream:45,
                 from swig/agg_buffer.h:7,
                 from src/agg.cxx:1582:
/work/local-b/sparc-sun-solaris2.9/bin/../lib/gcc/sparc-sun-solaris2.9/3.4.2/../../../../include/c++/3.4.2/cwchar:145:
error: `::btowc' has not been declared

···

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