puzzled

#!/bin/bash

cd ~/redhat/SPECS

BUILDOPTS_libsupertone='--define "_smp_mflags -j1"'

rpmbuild -ba --target=i386 libsupertone.spec ${BUILDOPTS_libsupertone}

# end script


When run STDOUT show:
rpmbuild -ba --target=i686 libsupertone.spec --define "_smp_mflags -j1"

But I get this error:

error: Macro % has illegal name (%define)
error: Macro % has illegal name (%define)
error: Macro % has illegal name (%define)
-j1": unknown option