--- src/gui/dialogs/qfontdialog_mac.mm.orig
+++ src/gui/dialogs/qfontdialog_mac.mm
@@ -141,6 +141,7 @@
     QFont newFont;
     if (cocoaFont) {
         int pSize = qRound([cocoaFont pointSize]);
+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
         CTFontDescriptorRef font = CTFontCopyFontDescriptor((CTFontRef)cocoaFont);
         // QCoreTextFontDatabase::populateFontDatabase() is using localized names
         QString family = QCFString::toQString((CFStringRef) CTFontDescriptorCopyLocalizedAttribute(font, kCTFontFamilyNameAttribute, NULL));
@@ -151,6 +152,23 @@
         newFont.setStrikeOut(resolveFont.strikeOut());
 
         CFRelease(font);
+#else
+	// This pre-Leopard version is buggy and was fixed in 717e36037cf246aa201c0aaf15a5dcbd7883f159
+	// see QTBUG-27415 https://codereview.qt-project.org/#/c/42830/
+        QString family(qt_mac_NSStringToQString([cocoaFont familyName]));
+        QString typeface(qt_mac_NSStringToQString([cocoaFont fontName]));
+
+        int hyphenPos = typeface.indexOf(QLatin1Char('-'));
+        if (hyphenPos != -1) {
+            typeface.remove(0, hyphenPos + 1);
+        } else {
+            typeface = QLatin1String("Normal");
+        }
+
+        newFont = QFontDatabase().font(family, typeface, pSize);
+        newFont.setUnderline(resolveFont.underline());
+        newFont.setStrikeOut(resolveFont.strikeOut());
+#endif
     }
     return newFont;
 }