diff --git a/mozilla/layout/generic/nsViewportFrame.cpp b/mozilla/layout/generic/nsViewportFrame.cpp
new file mode 100644
index 00000000000..fa655ed5c3a
--- /dev/null
+++ b/mozilla/layout/generic/nsViewportFrame.cpp
@@ -0,0 +1 @@
+// Just a placeholder for the time being...
diff --git a/mozilla/layout/html/base/src/nsViewportFrame.cpp b/mozilla/layout/html/base/src/nsViewportFrame.cpp
new file mode 100644
index 00000000000..fa655ed5c3a
--- /dev/null
+++ b/mozilla/layout/html/base/src/nsViewportFrame.cpp
@@ -0,0 +1 @@
+// Just a placeholder for the time being...