I try to install vg in ubuntu14, I have update g++, gcc and cmake and installed Protobuf 3. But faced an error, please help me how to resolve the problem, thank you!!! gcc (GCC) 4.9.1

g++ (GCC) 4.9.1

cmake version 3.16.4

The error is:

(cactus) bac@bac-IPP:~/software/vg$ . ./source_me.sh && make

. ./source_me.sh && cd deps/libhandlegraph && cmake . && make && cp libhandlegraph.a /home/bac/software/vg/lib && cp -r src/include/handlegraph /home/bac/software/vg/include

-- Configuring done

-- Generating done

-- Build files have been written to: /home/bac/software/vg/deps/libhandlegraph

make[1]: Entering directory `/home/bac/software/vg/deps/libhandlegraph'

make[2]: Entering directory `/home/bac/software/vg/deps/libhandlegraph'

make[3]: Entering directory `/home/bac/software/vg/deps/libhandlegraph'

make[3]: Leaving directory `/home/bac/software/vg/deps/libhandlegraph'

make[3]: Entering directory `/home/bac/software/vg/deps/libhandlegraph'

[ 33%] Building CXX object CMakeFiles/handlegraph_objs.dir/src/handle.cpp.o

In file included from /home/bac/software/vg/deps/libhandlegraph/src/handle.cpp:1:0:

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp: In member function ‘bool handlegraph::HandleGraph::for_each_edge(const Iteratee&, bool) const’:

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp:216:65: error: expected primary-expression before ‘)’ token

 return for_each_handle((std::function<bool(const handle_t&)>)[&](const handle_t& handle) -> bool {

                                                             ^

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp:216:68: error: expected primary-expression before ‘]’ token

 return for_each_handle((std::function<bool(const handle_t&)>)[&](const handle_t& handle) -> bool {

                                                                ^

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp:216:70: error: expected primary-expression before ‘const’

 return for_each_handle((std::function<bool(const handle_t&)>)[&](const handle_t& handle) -> bool {

                                                                  ^

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp:216:97: error: expected unqualified-id before ‘bool’

 return for_each_handle((std::function<bool(const handle_t&)>)[&](const handle_t& handle) -> bool {

                                                                                             ^

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp: In instantiation of ‘bool handlegraph::HandleGraph::for_each_edge(const Iteratee&, bool) const [with Iteratee = handlegraph::HandleGraph::get_edge_count() const::<lambda(const edge_t&amp;)&gt;]’:<="" p="">

/home/bac/software/vg/deps/libhandlegraph/src/handle.cpp:81:6: required from here

/home/bac/software/vg/deps/libhandlegraph/src/include/handlegraph/handle_graph.hpp:240:1: error: no return statement in function returning non-void [-Werror=return-type] }

^ cc1plus: some warnings being treated as errors

make[3]: * [CMakeFiles/handlegraph_objs.dir/src/handle.cpp.o] Error 1

make[3]: Leaving directory `/home/bac/software/vg/deps/libhandlegraph'

make[2]: * [CMakeFiles/handlegraph_objs.dir/all] Error 2

make[2]: Leaving directory `/home/bac/software/vg/deps/libhandlegraph'

make[1]: * [all] Error 2

make[1]: Leaving directory `/home/bac/software/vg/deps/libhandlegraph' make: * [lib/libhandlegraph.a] Error 2