> 
>

...snipped...
 
> I don't know how to search for what package owns lex in the RPM-world. A
> trip to rpmfind might take care of that.
> 

rpm -qf /path/to/file <-- shows which package owns file
rpm -qpl package.rpm <-- lists contents of rpm file
rpm -ql package <-- lists contents of installed package

Bart