https://src.fedoraproject.org/cgit/rpms/espeak.git/tree/espeak-1.48-gcc-6-fix.patch
diff --git a/src/tr_languages.cpp b/src/tr_languages.cpp
--- a/tr_languages.cpp
+++ b/tr_languages.cpp
@@ -198,7 +198,7 @@ static const unsigned short chars_ignore_zwnj_hyphen[] = {
 	0x200d,  1, // zero width joiner
 	0, 0 };
 
-const char string_ordinal[] = {0xc2,0xba,0};  // masculine ordinal character, UTF-8
+const char string_ordinal[] = {'\xc2','\xba',0};  // masculine ordinal character, UTF-8
 
 
 static Translator* NewTranslator(void)