What broke the build of geoip is that gcc 6 changed the default C++ standard from C++98 to C++14.
Note that this just changed the default, when told to process C++98 code gcc 6 does not differ in any significant way from gcc 5. Not all valid C++98 code is also valid C++11 and C++14 code. ompl 1.1.0 does not seem to be valid C++11 code (but according to the upstream changelog ompl >= 1.2.0 does require a C++11 compiler). There are at least two solutions for this FTBFS: I have confirmed that upstream 1.2.1 builds in unstable (manual build without Debian packaging), so fixing #835030 should also fix the FTBFS. If updating ompl is not easily possible for some reason, I have confirmed that building works when telling gcc that this is C++98 code by adding the follosing to debian/rules: export DEB_CXXFLAGS_MAINT_APPEND = -std=gnu++98 cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed -- debian-science-maintainers mailing list debian-science-maintainers@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/debian-science-maintainers