lp:mir FTBFS: surface.h:58:5: error: looser throw specifier for ‘virtual mir::shell::Surface::~Surface()’

[ 23%] Building CXX object src/server/shell/CMakeFiles/mirshell.dir/application_session.cpp.o
In file included from /home/dan/bzr/mir/bang/src/server/shell/application_session.cpp:20:0:
/home/dan/bzr/mir/bang/include/server/mir/shell/surface.h:58:5: error: looser throw specifier for ‘virtual mir::shell::Surface::~Surface()’
In file included from /home/dan/bzr/mir/bang/include/server/mir/shell/surface.h:23:0,
                 from /home/dan/bzr/mir/bang/src/server/shell/application_session.cpp:20:
/home/dan/bzr/mir/bang/include/server/mir/shell/surface_buffer_access.h:36:13: error: overriding ‘virtual mir::shell::SurfaceBufferAccess::~SurfaceBufferAccess() noexcept (true)’
make[2]: *** [src/server/shell/CMakeFiles/mirshell.dir/application_session.cpp.o] Error 1

(gcc-4.7 raring)