Description of Problem:

autoconf-2.52-5 contains autoconf-2.52f in reality; old ...-2.52-4 was -2.52d.
This relabeling is very confusing...

I don't see a reason why this packages can not be named as 'autoconf-2.52f-1' or
so. RPM works fine and can distinguish between this versions correctly:

----
$ python
>>> import rpm
>>> rpm.labelCompare(['0','2.52','1'], ['0','2.52d','1'])
-1
>>> rpm.labelCompare(['0','2.52d','1'], ['0','2.52','1'])
1
>>> rpm.labelCompare(['0','2.52d','1'], ['0','2.52f','1'])
-1
>>> rpm.labelCompare(['0','2.52f','1'], ['0','2.52d','1'])
1
----

Therefore, rpm would see the packages in order of

| autoconf-2.52-1 < autoconf-2.52d-1 < autoconf-2.52f-1

and upgrading will work without '--force' or so.