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diff --git a/clang/test/Sema/vfprintf-invalid-redecl.c b/clang/test/Sema/vfprintf-invalid-redecl.c
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+++ b/clang/test/Sema/vfprintf-invalid-redecl.c
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+// RUN: %clang_cc1 %s -fsyntax-only -verify
+// PR4290
+
+// The following declaration is not compatible with vfprintf(), but make
+// sure this isn't an error: autoconf expects this to build.
+char vfprintf(); // expected-warning {{incompatible redeclaration of library function 'vfprintf'}} expected-note {{'vfprintf' is a builtin}}