Reconsidering... I guess we could add checks for the presence of the
required header files and libraries. I'm reluctant to do a full
AC_CHECK_HEADER here because that will only succeed if we enable C++
in the configure script, and right now the extra overhead of enabling
C++ in libtool doesn't seem worth it. As such, we could just do an
Just a note: If we someday add a recursive configure (a separate
configure in the contrib directories), maybe we could extend it to
a separate configure in back-ndb too.