diff -urN a/gcc/ginclude/float.h b/gcc/ginclude/float.h
--- a/gcc/ginclude/float.h	2009-04-09 17:00:19.000000000 +0200
+++ b/gcc/ginclude/float.h	2010-06-05 12:03:41.887724045 +0200
@@ -236,3 +236,7 @@
 #endif /* __STDC_WANT_DEC_FP__ */
 
 #endif /* _FLOAT_H___ */
+
+#ifdef __MINGW32__
+#include_next<float.h>
+#endif