pbuilder build broken.

[Junichi Uekawa]

It's apparently broken somewhere in testsuite:

I: Running /usr/bin/dpkg-buildpackage -rfakeroot -us -uc '${DEBBUILDOPTS}'
dpkg-buildpackage: unknown option or argument ${DEBBUILDOPTS}


Usage: dpkg-buildpackage [<options> ...]

Options:
  -r<gain-root-command>
                 command to gain root privileges (default is fakeroot).
  -R<rules>      rules file to execute (default is debian/rules).
  -p<sign-command>
  -d             do not check build dependencies and conflicts.
  -D             check build dependencies and conflicts.
  -T<target>     call debian/rules <target> with the proper environment
  --as-root      ensure -T calls the target with root rights
  -j[<number>]   specify jobs to run simultaneously } passed to debian/rules
  -k<keyid>      the key to use for signing.
  -sgpg          the sign-command is called like GPG.
  -spgp          the sign-command is called like PGP.
  -us            unsigned source.