[coretext] Add version guards for kCTLanguageAttributeName
diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 06e001c..9097cce 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -698,8 +698,15 @@
CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
kCTVerticalFormsAttributeName, kCFBooleanTrue);
}
+
if (buffer->props.language)
{
+/* What's the iOS equivalent of this check?
+ * The symbols was introduced in iOS 7.0.
+ * At any rate, our fallback is safe and works fine. */
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
+# define kCTLanguageAttributeName CFSTR ("NSLanguage")
+#endif
CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
hb_language_to_string (buffer->props.language),
kCFStringEncodingUTF8,
