For v3.6 (and perhaps other versions, i haven't checked), the source tarball has no CVS directories.
Here is a suitable ChangeLog entry: 2010-02-17 Thien-Thi Nguyen <[email protected]> (tiny change) Don't bother removing non-existent CVS directories. * remove.nonfree: Delete command to find/remove CVS directories. Index: remove.nonfree =================================================================== --- remove.nonfree (revisione 99) +++ remove.nonfree (copia locale) @@ -182,9 +182,6 @@ rm -rfv browser/branding/nightly -#remove CVS directories -find -iname CVS -type d | xargs rm -rvf - patch -p0 < locales-strings.patch patch -p0 < nullplugin.patch -- http://gnuzilla.gnu.org
