Crazy idea: PermittedHours in .desktop files

It would be rather useful if there was a PermittedHours field in the .desktop file spec. It would list the hours during which the program could be run. That's not just for kids, it's also for me, in the manner of LeechBlock:

[Desktop Entry]
Version=1.0
Type=Application
Name=Some Program I Use For Work
Comment=But let's say I don't want to be tempted to spend all evening working on it
Exec=foo
PermittedHours=9-17

[Desktop Entry]
Version=1.0
Type=Application
Name=Aisleriot
Comment=And I definitely shouldn't be playing this during work hours
Exec=aisleriot
PermittedHours=0-9,17-23

I wonder how best we could do per-user settings, though.

My idea is to prevent launching the program during those hours. What would happen if the system saw the program was still running when the time had expired, I'm not sure. Maybe nothing, or maybe it would put up a notification telling me I have five minutes to quit or the process gets it.

I know nanny does some of this, but I wonder whether it's generally something that should exist in application launchers.

What do you think? Worth suggesting to them?

libtool issue

And on another issue: nobody on IRC seems to know a solution, so perhaps someone here does: is there a known issue that would cause libtool to add an X to the start of every line of its input? (The result looks like this.)

This is rather a nuisance, because it stops me doing things.

Update: autoreconf -f -i -v fixed it. Thanks, anonymous hacker!