Reference: https://sources.debian.net/src/espeak/1.48.04%2Bdfsg-5/debian/patches/char_cast/

--- a/src/tr_languages.cpp
+++ b/src/tr_languages.cpp
@@ -198,7 +198,7 @@ static const unsigned short chars_ignore
 	0x200d,  1, // zero width joiner
 	0, 0 };
 
-const char string_ordinal[] = {0xc2,0xba,0};  // masculine ordinal character, UTF-8
+const char string_ordinal[] = {(char)0xc2,(char)0xba,0};  // masculine ordinal character, UTF-8
 
 
 static Translator* NewTranslator(void)