Merge pull request #4443 from hummeltech/png_io.hppMissingString
Add missing `#include <string>` to `include/mapnik/png_io.hpp`
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@ -40,6 +40,7 @@ extern "C" {
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#include <png.h>
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}
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#include <set>
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#include <string>
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MAPNIK_DISABLE_WARNING_POP
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#define MAX_OCTREE_LEVELS 4
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