Xournal is also not set up to figure out what software you'd want to use to open links; I'd need to figure out how evince goes about it. For the record, Xournal doesn't need to know how to open links; it just needs to have a configuration option that is "command to open urls". Under MacOS this would probably be "open", under Linux this would probably be "xdg-open" (to use your default browser) or something like "firefox" or "google-chrome" (to use a specific browser).
This patch performs the same set of changes on vice.texi.
Remove outdated information from FEEDBACK
configure replaces CFLAGS but honors LDFLAGS, leading to incompatible command lines