-extern CFStringEncodingConverter __CFConverterASCII;
-extern CFStringEncodingConverter __CFConverterISOLatin1;
-extern CFStringEncodingConverter __CFConverterMacRoman;
-extern CFStringEncodingConverter __CFConverterWinLatin1;
-extern CFStringEncodingConverter __CFConverterNextStepLatin;
-extern CFStringEncodingConverter __CFConverterUTF8;
+extern const CFStringEncodingConverter __CFConverterASCII;
+extern const CFStringEncodingConverter __CFConverterISOLatin1;
+extern const CFStringEncodingConverter __CFConverterMacRoman;
+extern const CFStringEncodingConverter __CFConverterWinLatin1;
+extern const CFStringEncodingConverter __CFConverterNextStepLatin;
+extern const CFStringEncodingConverter __CFConverterUTF8;