Not sure if it helps, but the compiler seems to be complaining about this line:

BOOST_STATIC_ASSERT(BOOST_PYTHON_OFFSETOF(rvalue_from_python_storage<T>,stage1)
== 0);

Where Solaris appears to define offsetof() in /usr/include/iso/stddef_iso.h as:

#if __cplusplus >= 199711L
#define offsetof(s, m)  (std::size_t)(&(((s *)0)->m))
#else
#define offsetof(s, m)  (size_t)(&(((s *)0)->m))
#endif

Not sure if there is much that I can do to help aside from saying "it
works for me" using gcc 4.1.1.