I am somewhat unhappy about the fact that this patch relies (at the
top) on finding rpmbuild in /usr/bin/. A better patch would search the
user's path properly, or perhaps be generated via configure to know
the correct rpmbuild path.
an improvement because you have to do a configure before using any makefile.
It used to be "configure; make rpm" and now it's just
"./build/redhat/make-rpm".