problem with libgnomeuimm 32 bit and 64 bit

I'm using the Eval Edition of Suse 10.0. Now I've encountered a problem with the libgnomeuimm library and some other ..mm libraries, too. There is a 64 bit and a 32 bit version, but if I install them via Yast then both packages have exactly the same name. So can I install only one version of them at a time? I wanted to use my AMD64 system for building the 64 bit and 32 bit version of an application and it would be convenient if I could've installed both developer packages at the same time. Other libraries like libgnomeui have a libgnomeui and a libgnomeui-32bit rpm package by the way. Regards, Detlef