One idea would be to first check which versions of gtksourceview and gtksourceviewmm are shipped with various distros. Check against the base list at http://wiki.inkscape.org/wiki/index.php/Tracking_Dependencies#Distros
*If* it is common enough, then it might be a good idea. But checking will also allow us to know which versions we can count on and which versions need to be optional.
One idea would be to first check which versions of gtksourceview and gtksourceviewmm are shipped with various distros. Check against the base list at wiki.inkscape. org/wiki/ index.php/ Tracking_ Dependencies# Distros
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*If* it is common enough, then it might be a good idea. But checking will also allow us to know which versions we can count on and which versions need to be optional.