> When I launch dia I get a dialog which reads "Could not find plugin init
> function in `/opt/dia/lib/dia/libxslt_filter.la`"
I'm pretty sure that means that you don't have libxslt-dev (or whatever
the appropriate developer package for libxslt is for your distro)
installed.
It doesn't bug out during the make process, but if you look really hard
(or pipe the output of configure to a file) you'll notice that configure
indicates that libxslt was not found.
-Mike