I copied qubes-os-r4.1.conf to create builder.conf, and deleted all lines in the COMPONENTS section, except vmm-xen. Then I make get-sources and make vmm-xen, but it threw out this error:
Makefile.generic:45: *** Building packages for fc32 not supported by any of configured plugins. Stop.
How can I fix the problem so that I can build vmm-xen ? Any help is appreciated.