fogot :)
add checks for PQXX_HAVE_AUTO_PTR PQXX_HAVE_C_ISINF PQXX_HAVE_C_ISINF  PQXX_HAVE_GCC_CONST PQXX_HAVE_GCC_DEPRECATED PQXX_HAVE_GCC_NORETURN PQXX_HAVE_GCC_PURE