There is a line missing from boost\static_assert.hpp:

template <bool x> struct STATIC_ASSERTION_FAILURE;

template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
// The following line was missing and therefore caused a compile failure in ublas under MSVC7.1:
template <> struct STATIC_ASSERTION_FAILURE<false> { enum { value = 0 }; };