dbm, ndbm, gdbm, and Berkeley db. For the *db* extension, if
Configure can find the appropriate header files and libraries, it will
automatically include that extension. The threading extension needs
-to be specified explicitely (see L<Threads>).
+to be specified explicitly (see L<Threads>).
Those libraries are not distributed with perl. If your header (.h) files
for those libraries are not in a directory normally searched by your C
subversions may not have all the compatibility wrinkles ironed out
yet.
-=head2 Upgrading from 5.13.4 or earlier
+=head2 Upgrading from 5.13.7 or earlier
B<Perl 5.13.8 is binary incompatible with Perl 5.13.7 and any earlier
Perl release.> Perl modules having binary parts