buildreq and arch

["Gene C." <czar czarc net>]

Is there a way to specify the architecture of a buildreq package?

Example:  One the amd64 (x86_64), building gcc requires the glibc-devel 
package for the i686 architecture also be installed (besides the x86_64 
package) in order to actually build gcc.  Is there a way to specify this?
-- 
Gene