diff -Naurp mlgmpidl/gmp_caml.h mlgmpidl2/gmp_caml.h
--- mlgmpidl/gmp_caml.h	2007-07-11 13:29:31.000000000 +0000
+++ mlgmpidl2/gmp_caml.h	2010-07-03 16:09:33.000000000 +0000
@@ -14,6 +14,16 @@
 #if defined(HAS_MPFR)
 #if HAS_MPFR!=0
 #include "mpfr.h"
+#ifndef GMP_RND_MAX
+#define GMP_RND_MAX (MPFR_RNDNA - 1)
+#define mpfr_random(x)	\
+	{\
+		gmp_randstate_t s;\
+		gmp_randinit_default(s);\
+		mpfr_urandomb(x,s);\
+		gmp_randclear(s);\
+	}
+#endif
 #endif
 #endif
 #include "caml/mlvalues.h"