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I've recently upgraded to a 64-bit machine (Kubuntu 12.04.02 AMD64) and in trying to assemble the list of things to compile some things I get conflicts. In trying to install
lib64readline6-dev I get:
The following packages have unmet dependencies: lib64readline6:i386 : Depends: lib64tinfo5:i386 but it is not going to be installed Depends: libc6-amd64:i386 (>= 2.11) but it is not going to be installed
I variously also try to include
libc6-i386 (32 bit library for AMD64) as well as other combinations of things but I still get the conflicts.