Bug#834009: python-apt: FTBFS in stretch (missing build-depends on gnupg)

[Santiago Vila <sanvila@debian.org>]

Package: src:python-apt
Version: 1.1.0~beta4
Severity: serious

Dear maintainer:

I tried to build this package with "dpkg-buildpackage -A"
(which is what the "Arch: all" autobuilder would do to build it)
but it failed:

--------------------------------------------------------------------------------
[...]
 debian/rules build-indep
dh build-indep --with python2,python3,sphinxdoc
   dh_testdir -i
   dh_update_autotools_config -i
   dh_auto_configure -i
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_auto_build
	python2.7-dbg setup.py build --force
running build
running build_py
creating build/lib.linux-x86_64-2.7-pydebug
creating build/lib.linux-x86_64-2.7-pydebug/apt

[... snipped ...]

AptKeyError: The apt-key script failed with return code 255:
/tmp/tmplfwiB2/fakeroot-apt-key add /tmp/tmpHWnppm
stdout: 
stderr: Error: gnupg or gnupg2 do not seem to be installed,
Error: but apt-key requires gnupg or gnupg2 for this operation.

--------------------------------------------------------------------------------

The gnupg package is not "Essential: yes". To reproduce, please try to
build the package on a chroot not having gnupg installed (sbuild now
allows this).

Thanks.