diff -Nru cyphesis-cpp-0.6.0/debian/changelog cyphesis-cpp-0.6.0/debian/changelog
--- cyphesis-cpp-0.6.0/debian/changelog	2014-12-05 19:34:38.000000000 +0000
+++ cyphesis-cpp-0.6.0/debian/changelog	2015-10-15 01:55:03.000000000 +0000
@@ -1,3 +1,13 @@
+cyphesis-cpp (0.6.0-3+rpi1) stretch-staging; urgency=medium
+
+  * Force -std=c++11 to allow build with new sigc++ (see bug 800399)
+  * add -fpermissive to fix
+    /usr/include/Mercator-0.3/Mercator/Terrain.h:102:39: error: ‘constexpr’ 
+    needed for in-class initialization of static data member ‘const float 
+    Mercator::Terrain::defaultLevel’ of non-integral type [-fpermissive]
+    and similar errors
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 15 Oct 2015 01:18:43 +0000
+
 cyphesis-cpp (0.6.0-3) unstable; urgency=medium
 
   * Prevent d/postinst from violating policy (Closes: #767818)
diff -Nru cyphesis-cpp-0.6.0/debian/rules cyphesis-cpp-0.6.0/debian/rules
--- cyphesis-cpp-0.6.0/debian/rules	2014-12-02 20:01:25.000000000 +0000
+++ cyphesis-cpp-0.6.0/debian/rules	2015-10-15 01:55:13.000000000 +0000
@@ -2,6 +2,7 @@
 # Uncomment this to turn on verbose mode.
 export DH_VERBOSE=1
 export DH_OPTIONS=-v
+export CXXFLAGS += -std=c++11 -fpermissive
 
 %:
 	dh $@ --parallel --with autoreconf,python2