diff --git a/test/config_build_check.cpp b/test/config_build_check.cpp
index b95d1c5e..480e93ef 100644
--- a/test/config_build_check.cpp
+++ b/test/config_build_check.cpp
@@ -6,6 +6,8 @@
 //  See http://www.boost.org/libs/config for the most recent version.//
 //  Revision $Id$
 //
+// We include this as it contains some workarounds we may need (like a declaration for ::gets to get clang building):
+#include <boost/config.hpp>
 
 #  include "../test/boost_has_int128.ipp"
 #  include "../test/boost_no_constexpr.ipp"