I too am getting this same issue.. but editing out the "-Wc++14-extensions" from the Makefile only gives me more errors..
rc/.deps/renderd-gen_tile.Tpo -c -o src/renderd-gen_tile.o `test -f 'src/gen_tile. cpp' || echo './'`src/gen_tile.cpp
In file included from /usr/local/include/mapnik/map.hpp:32:0,
from src/gen_tile.cpp:2:
/usr/local/include/mapnik/params.hpp: In instantiation of ‘mapnik::value_holder::v alue_holder(T&&) [with T = char*&]’:
src/gen_tile.cpp:196:34: required from here
/usr/local/include/mapnik/params.hpp:62:49: error: no matching function for call t o ‘mapbox::util::variant<mapnik::value_null, long int, double, std::basic_string<c har, std::char_traits<char>, std::allocator<char> >, bool>::variant(char*&)’
: value_holder_base(std::forward<T>(obj))
^
In file included from /usr/local/include/mapnik/util/variant.hpp:27:0,
from /usr/local/include/mapnik/params.hpp:29,
from /usr/local/include/mapnik/map.hpp:32,
from src/gen_tile.cpp:2:
/usr/local/include/mapnik/mapbox/variant.hpp:624:20: note: candidate: mapbox::util ::variant<Types>::variant(mapbox::util::variant<Types>&&) [with Types = {mapnik::v alue_null, long int, double, std::basic_string<char, std::char_traits<char>, std:: allocator<char> >, bool}]
VARIANT_INLINE variant(variant<Types...>&& old)
^~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:624:20: note: no known conversion f or argument 1 from ‘char*’ to ‘mapbox::util::variant<mapnik::value_null, long int, double, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, b ool>&&’
/usr/local/include/mapnik/mapbox/variant.hpp:618:20: note: candidate: mapbox::util ::variant<Types>::variant(const mapbox::util::variant<Types>&) [with Types = {mapn ik::value_null, long int, double, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool}]
VARIANT_INLINE variant(variant<Types...> const& old)
^~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:618:20: note: no known conversion f or argument 1 from ‘char*’ to ‘const mapbox::util::variant<mapnik::value_null, lon g int, double, std::basic_string<char, std::char_traits<char>, std::allocator<char > >, bool>&’
/usr/local/include/mapnik/mapbox/variant.hpp:612:20: note: candidate: template<cla ss T, class Traits, class Enable> mapbox::util::variant<Types>::variant(T&&)
VARIANT_INLINE variant(T&& val) noexcept(std::is_nothrow_constructible<typena me Traits::target_type, T&&>::value)
^~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:612:20: note: template argument ded uction/substitution failed:
/usr/local/include/mapnik/mapbox/variant.hpp:611:15: error: no type named ‘type’ i n ‘struct std::enable_if<false, void>’
typename Enable = typename std::enable_if<Traits::is_valid && !std: :is_same<variant<Types...>, typename Traits::value_type>::value>::type >
^~~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:606:20: note: candidate: mapbox::util ::variant<Types>::variant(mapbox::util::no_init) [with Types = {mapnik::value_null , long int, double, std::basic_string<char, std::char_traits<char>, std::allocator <char> >, bool}]
VARIANT_INLINE variant(no_init) noexcept
^~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:606:20: note: no known conversion f or argument 1 from ‘char*’ to ‘mapbox::util::no_init’
/usr/local/include/mapnik/mapbox/variant.hpp:599:20: note: candidate: mapbox::util ::variant<Types>::variant() [with Types = {mapnik::value_null, long int, double, s td::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool}]
VARIANT_INLINE variant() noexcept(std::is_nothrow_default_constructible<first _type>::value)
^~~~~~~
/usr/local/include/mapnik/mapbox/variant.hpp:599:20: note: candidate expects 0 a rguments, 1 provided
Makefile:1136: recipe for target 'src/renderd-gen_tile.o' failed
make[1]: *** [src/renderd-gen_tile.o] Error 1
make[1]: Leaving directory '/home/dennis/src/mod_tile'
Makefile:1300: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1
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