clang++ -c -std=c++1z -stdlib=libc++ -O3 -g -fPIC -fexceptions -ferror-limit=1 -fno-omit-frame-pointer -Wall -Wpedantic -DPROJECT_DIR='std::experimental::filesystem::path("ksp_plugin_adapter/")' -DSOLUTION_DIR='std::experimental::filesystem::path("./")' -DTEMP_DIR='std::experimental::filesystem::path("/tmp")' -DNDEBUG -mmacosx-version-min=10.8 -arch x86_64 -I. -Ideps/glog/src -Ideps/protobuf/src -Ideps/Optional -Ideps/eggsperimental_filesystem/ tools/generate_configuration.cpp -o obj/tools/generate_configuration.o
In file included from tools/generate_configuration.cpp:2:
In file included from ./tools/generate_configuration.hpp:6:
In file included from ./geometry/named_quantities.hpp:4:
In file included from ./geometry/affine_map.hpp:4:
In file included from ./geometry/point.hpp:9:
In file included from ./geometry/barycentre_calculator.hpp:48:
./geometry/barycentre_calculator_body.hpp:39:3: error: declaration conflicts with target
      of using declaration already in scope
T Barycentre(std::pair<T, T> const & ts,
  ^
./geometry/barycentre_calculator.hpp:35:3: note: target of using declaration
T Barycentre(std::pair<T, T> const& ts,
  ^
./geometry/barycentre_calculator.hpp:42:39: note: using declaration
using internal_barycentre_calculator::Barycentre;
                                      ^