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diff --git a/thirdparty/harfbuzz/src/hb-subset.hh b/thirdparty/harfbuzz/src/hb-subset.hh
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+++ b/thirdparty/harfbuzz/src/hb-subset.hh
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+/*
+ * Copyright © 2018  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Garret Rieger, Roderick Sheeter
+ */
+
+#ifndef HB_SUBSET_HH
+#define HB_SUBSET_HH
+
+
+#include "hb.hh"
+
+#include "hb-subset.h"
+
+#include "hb-machinery.hh"
+#include "hb-subset-input.hh"
+#include "hb-subset-plan.hh"
+
+struct hb_subset_context_t :
+       hb_dispatch_context_t<hb_subset_context_t, bool, HB_DEBUG_SUBSET>
+{
+  const char *get_name () { return "SUBSET"; }
+  static return_t default_return_value () { return true; }
+
+  private:
+  template <typename T, typename ...Ts> auto
+  _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN
+  ( obj.subset (this, std::forward<Ts> (ds)...) )
+  template <typename T, typename ...Ts> auto
+  _dispatch (const T &obj, hb_priority<0>, Ts&&... ds) HB_AUTO_RETURN
+  ( obj.dispatch (this, std::forward<Ts> (ds)...) )
+  public:
+  template <typename T, typename ...Ts> auto
+  dispatch (const T &obj, Ts&&... ds) HB_AUTO_RETURN
+  ( _dispatch (obj, hb_prioritize, std::forward<Ts> (ds)...) )
+
+  hb_blob_t *source_blob;
+  hb_subset_plan_t *plan;
+  hb_serialize_context_t *serializer;
+  hb_tag_t table_tag;
+
+  hb_subset_context_t (hb_blob_t *source_blob_,
+		       hb_subset_plan_t *plan_,
+		       hb_serialize_context_t *serializer_,
+		       hb_tag_t table_tag_) :
+		        source_blob (source_blob_),
+			plan (plan_),
+			serializer (serializer_),
+			table_tag (table_tag_) {}
+};
+
+
+#endif /* HB_SUBSET_HH */