Description of problem:
In rpm-spec-mode, when building a package from the spec file in your buffer, it
usually (always?) complains that the buffer is read-only, and does not display
the rpmbuild output as I had come to expect in earlier versions.

Version-Release number of selected component (if applicable):
emacs-22.1-1.fc7
emacs-common-22.1-1.fc7

How reproducible:
Attempt to build an (S)RPM from a specfile (seems to also happen with prep,
build, install) within an emacs buffer.

Steps to Reproduce:
1. open foo.spec in emacs
2. C-c C-b a (rpm-build-all)
  
Actual results:
In the minibuffer:
error in process filter: Buffer is read-only: #<buffer *rpmbuild -ba foo.spec*>
In the output buffer:
error in process filter: Buffer is read-only: #<buffer *rpmbuild -ba foo.spec*>
error in process filter: rpm-command-filter: Buffer is read-only: #<buffer
*rpmbuild -ba foo.spec*>
(repeated many times, but probably not as many as once for each line of output)

Expected results:
The usual rpmbuild output

Additional info:
I'm not sure just where /usr/share/emacs/site-lisp/rpm-spec-mode.el comes from;
I grabbed the SRPM to see, and all I know now is that it's not part of the
standard emacs tarball.
I don't know much about Lisp or emacs internals, but I'd guess the problem lies
between line 957 and 1010, where function rpm-build is defined. Perhaps you need
to setq a read-only variable for the buffer?

I don't think anything in my .emacs would do it, but here it is just in case
(some minor and obvious obfuscation):
(custom-set-variables
  ;; custom-set-variables was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
 '(backup-by-copying-when-linked t)
 '(case-fold-search t)
 '(column-number-mode t)
 '(current-language-environment "Latin-1")
 '(default-input-method "latin-1-prefix")
 '(fringe-mode 0 nil (fringe))
 '(global-font-lock-mode t nil (font-lock))
 '(inhibit-splash-screen t)
 '(inhibit-startup-echo-area-message "foobar")
 '(mail-self-blind t)
 '(show-paren-mode t nil (paren))
 '(transient-mark-mode t)
 '(user-mail-address "foo+bar"))
(custom-set-faces
  ;; custom-set-faces was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
 )