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--- a/crawl-ref/source/ui.orig.cc	2020-03-22 05:52:08.000000000 +0100
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+++ b/crawl-ref/source/ui.cc	2020-04-22 14:56:57.938271318 +0200
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@@ -30,6 +30,8 @@
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 # include "view.h"
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 #endif
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+#include <cwctype>
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+
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 #ifdef USE_TILE_WEB
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 # include <unordered_map>
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 #endif