https://github.com/CleverRaven/Cataclysm-DDA/pull/74229

Index: src/third-party/flatbuffers_int/stl_emulation.h
--- src/third-party/flatbuffers_int/stl_emulation.h.orig
+++ src/third-party/flatbuffers_int/stl_emulation.h
@@ -626,7 +626,7 @@ class span FLATBUFFERS_FINAL_CLASS {
  private:
   // This is a naive implementation with 'count_' member even if (Extent != dynamic_extent).
   pointer const data_;
-  const size_type count_;
+  size_type count_;
 };
 
  #if !defined(FLATBUFFERS_SPAN_MINIMAL)
