2007-10-11  Roger Sayle  <roger@eyesopen.com>

	* acinclude.m4 (GLIBCXX_CHECK_SYSTEM_ERROR): Add EOVERFLOW for Tru64.
        * configure: Regenerate.
        * config/os/generic/error_constants.h: Guard.
        * testsuite/19_diagnostics/headers/system_error/
        types_std_c++0x.cc: Same.