In the ebuild touch -r configure doc/*.{texi,info}* messes up timestamps on texi vs info*, so that info pages don't get regenerated to be properly slotted. Can be tested with 'info automake1.12'. Also, something might need to be done about automake-history.info, otherwise there'll be a problem once automake 1.13 with the same (or updated) file gets released.
So, just like I expected, the other problem did affect automake 1.13 and has already been fixed. Now, could somebody fix the first problem ?
should be fixed via bug 464146