An Inkscape r14630 build with Cairo 1.14.6 and the ruler patched is available here:
ftp://download.tuxfamily.org/inkscape/inkscape-14630-Cairo-1.14.6+patch.7z
The patch is based on the ones applied to the Gimp code, and should fix
https://bugs.launchpad.net/inkscape/+bug/1351597
Please test!
--
Nicolas