https://github.com/freebsd/freebsd-ports/commit/e6daa211c609bde6ed3fe00fd5ce675714371805

Index: src/text/fmt/xp/fv_View_protected.cpp
--- src/text/fmt/xp/fv_View_protected.cpp.orig
+++ src/text/fmt/xp/fv_View_protected.cpp
@@ -5795,7 +5795,7 @@ UT_UCS4Char * FV_View::_lookupSuggestion(fl_BlockLayou
 		UT_uint32 len = iLength;
 		for (UT_uint32 ldex=0; ldex < len && ldex < INPUTWORDLEN; ldex++)
 		{
-			stMisspelledWord += *pWord == UCS_RQUOTE ? '\'' : *pWord;
+			stMisspelledWord += *pWord == UCS_RQUOTE ? U'\'' : *pWord;
 			++pWord;
 		}
 
