use feature test for <execution>
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@ -54,7 +54,7 @@ MAPNIK_DISABLE_WARNING_POP
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#include <sstream>
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#include <sstream>
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#include <algorithm>
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#include <algorithm>
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#if __cplusplus >= 201703L
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#if __cpp_lib_execution >= 201603
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#include <execution>
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#include <execution>
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#endif
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#endif
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