I wrote some kind a fork of bootmenu for encrypting partitions with ability to store secret on smart card. And libltdl3 needed for opensc stuffs.

When you saying "unpack it manually" you mean "apt-get source libltdl3"?
But there is already "--prefix=/usr"... and I can't find anything about optify there

[upd] ok, so it will be dirty hack... %)