diff --git a/unbundled-apache b/unbundled-apache
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index 0000000..c301258
--- /dev/null
+++ b/unbundled-apache
@@ -0,0 +1,4 @@
+The existence of this file in external/apache-http implies
+that the version of the library here is unbundled. The build system
+can test for its existence to decide whether or not to add a
+dependency to this library.