on Windows XP, build RPM openfire

ant installer.rpm 

ERROR:

build.xml:1117: java.io.IOException: CreateProcess: rpm --define "_topdirC:\openfire\work\rpm" -ba --define "OPENFIRE_VERSION 3.5.2" --define "OPENFIRE_SOURCE openfire_src_3_5_2.tar.gz" --define "OPENFIRE_BUILDDATE Sun Jul 06 2008" SPECS/openfire.spec error=2

Does this means I can not build rpm on windows?

Thanks for help.

Dave