if test -z "${BOOST_THREAD_LIB}"; then
AC_MSG_ERROR([Boost thread development libraries required])
fi
if test -z "${BOOST_TEST_LIB}"; then
AC_MSG_ERROR([Boost unit test framework libraries required])
fi
if test -z "${BOOST_THREAD_LIB}"; then
AC_MSG_ERROR([Boost thread development libraries required])
fi
if test -z "${BOOST_TEST_LIB}"; then
AC_MSG_ERROR([Boost unit test framework libraries required])
fi