The configure script checks whether it is possible to compile a use of
POPpx without an n_a variable; if not, the source code then defines
those variables. This is slower than including Perl's patchlevel.h
and comparing the version numbers to 5.8.8 but I expect this to be
more reliable as well.
instead of the URI, content, and length of the entry. Change the hooks
to use add_fragment. This should fix the memory leakage when multiple
hooks change the same document, closing bug 703.
