<p>This is part of my log.<br>
<code>/usr/local/include/mapnik/params.hpp: In instantiation of ‘mapnik::value_holder::value_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 to ‘mapbox::util::variant<mapnik::value_null, long int, double, std::basic_string<char, 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:598:20: note: candidate: mapbox::util::variant<Types>::variant(mapbox::util::variant<Types>&&) [with Types = {mapnik::value_null, long int, double, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool}] VARIANT_INLINE variant(variant<Types...>&& old) noexcept(std::is_nothrow_move_constructible<types>::value)</code></p>
<p><code>/usr/local/include/mapnik/mapbox/variant.hpp:573:20: note: candidate expects 0 arguments, 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/zs/mod_tile' Makefile:1300: recipe for target 'all-recursive' failed make: *** [all-recursive] Error 1</code></p>
<p>I google some same issues,but i can not find solutions. And i install mapnik from source.</p>

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