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I can't find the option to enable line numbering. It'd be very helpful!

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Nevermind, I hovered over the grayed-out option and it said to install gnome-python-desktop. – trusktr Apr 5 '12 at 7:14
up vote 1 down vote accepted

Just believe it needs other dependencies, I saw them on Meld homepage but they are optional. On Fedora, try this

yum install gtksourceview
yum install gnome-python2-gtksourceview
yum install gnome-python2-gnomeprint 
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I had this problem on Ubuntu and just to spare another unobservant person the time I spent digging around for it I thought I'd add an answer here as well.

If you go into preferences you can see that the option to show line numbers is grayed out but if you hover over it it says to install python-gtksourceview2.

So on ubuntu:

sudo apt-get install python-gtksourceview2

And you should be good to go.

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