dnl Starting here is a bunch of local macros



AC_DEFUN([AC_CXX_DYNAMIC_CAST],
        [AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
        ac_cv_cxx_dynamic_cast,
        [AC_LANG_SAVE
         AC_LANG_CPLUSPLUS
         AC_TRY_COMPILE([#include <typeinfo>
        class Base { public : Base () {} virtual void f () = 0;};
        class Derived : public Base { public : Derived () {} virtual void f () {} };],[
        Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
         ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
         AC_LANG_RESTORE
        ])
        if test "$ac_cv_cxx_dynamic_cast" = yes; then
          AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
        fi
        ])

