diff --git a/config/has_e_float.cpp b/config/has_e_float.cpp
new file mode 100644
index 0000000..1f3b305
--- /dev/null
+++ b/config/has_e_float.cpp
@@ -0,0 +1,15 @@
+//  Copyright John Maddock 2011.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+#ifdef _MSC_VER
+#  pragma warning (disable : 4100) // unreferenced formal parameter
+#endif
+
+#define E_FLOAT_TYPE_EFX
+
+#include <e_float/e_float.h>
+#include <functions/functions.h>
+