Here is a very small patch (using linux-any) to fix the issue.
Erwan.
diff -Naur a/debian/control b/debian/control
--- a/debian/control 2016-02-04 17:19:35.952421456 +0100
+++ b/debian/control 2016-02-04 17:20:04.896499097 +0100
@@ -10,8 +10,7 @@
X-Python-Version: >= 2.7
Package: calendarserver
-Architecture: alpha amd64 arm64 armel armhf hppa i386 m68k mips mipsel powerpc
- ppc64 ppc64el s390x sparc x32
+Architecture: linux-any
Depends: ${shlibs:Depends}, ${misc:Depends}, ${python:Depends},
memcached, python-zope.interface (>= 4), python-openssl (>= 0.9),
python-kerberos, python-xattr (>= 0.5), python-pygresql (>= 4.1.1),
