--- qt-everywhere-src-5.15.16.old/qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn
+++ qt-everywhere-src-5.15.16/qtwebengine/src/3rdparty/chromium/content/browser/BUILD.gn
@@ -40,6 +40,7 @@
     "//content/browser/devtools:protocol_sources",
     "//content/common:buildflags",
     "//third_party/inspector_protocol:crdtp",
+    "//components/spellcheck:buildflags",
   ]
 
   sources = [