Comment 9 for bug 714864

Here's an updated debdiff for maverick with in-line configure.in change to disable the "feature" causing the build failure.
As far as I know that feature isn't actually used by iTalc itself.

I'm pretty sure the type issue can be fixed, but none of the tricks I found on the internet fixed it, so after an hour of poking at it, I just looked at what could be changed to have it build.
Newer version of iTalc ship with a new version of the x11vnc lib which doesn't have the issue.