diff --git a/gcc/config/i386/xm-isc.h b/gcc/config/i386/xm-isc.h
new file mode 100644
index 00000000000..83f6e158d13
--- /dev/null
+++ b/gcc/config/i386/xm-isc.h
@@ -0,0 +1,4 @@
+#define REAL_VALUE_ATOF(x) strtod ((x), (char **)0)
+extern double strtod ();
+
+#include "xm-i386v.h"