Calling signals from outside is only possible with Qt5. This is probably the wrong hack anyway

src/scintillaeditor.cpp

@@ -71,7 +71,7 @@ QString ScintillaEditor::toPlainText()
 void ScintillaEditor::setContentModified(bool modified)
 {
   // FIXME: Due to an issue with QScintilla, we need to do this on the document itself.
-#if QSCINTILLA_VERSION >= 0x020800
+#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
   qsci->SCN_SAVEPOINTLEFT();
 #endif
   qsci->setModified(modified);