I tried to build this package in stretch with "dpkg-buildpackage -A"
(which is what the "Arch: all" autobuilder would do to build it)
but it failed:
A few notes on this bug (note: i'm just a derivative maintainer taking a
quick look at the bug, not a maintainer of this package)
1. It is not specific to building with dpkg-buildpackage -A [1][2]
2. The actual failure seems to be caused by indirectly including a C++
header while building with a plain C compiler.
3. There currently appears to be an (apparently uncoordinated) libzorpll
transition going on which I suspect may be the trigger for this bug.
[1]
http://buildd.raspbian.org/status/fetch.php?pkg=zorp&arch=armhf&ver=3.9.5-7.1%2Bb3&stamp=1476485016
[2]
https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/zorp.html