Don't mess with META:Release.
+ Do the original META:Release messing if the file .official exists.
Support new option --linuxdir to specify location of kernel source tree.
+ Use --with-linux{-obj} values from previous ./configure run.
+ Use --with-spl{-obj} values from previous ./configure run.
+ _configure was specified earlier, but never used. Use it!
Remove '-g -O2' when building zvol_id.
+ crashes on 64bit kernel with 32bit userland.
Add --keep-version to alien
+ So that not all packages end up with <version>-0.
Ignore *.{deb,rpm,tar.gz} files in the top directory.
Support building packages with debugging enabled.
+ Not built automatically though. Need to run make with:
  rpm-kmod-debug, rpm-utils-debug or rpm-debug to build all.
  deb-kmod-debug, deb-utils-debug or deb-debug to build all.
Possibility to disable (not start) zfs at bootup.