diff --git a/SheepShaver/src/kpx_cpu/src/mathlib/mathlib-x86_64.hpp b/SheepShaver/src/kpx_cpu/src/mathlib/mathlib-x86_64.hpp
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+++ b/SheepShaver/src/kpx_cpu/src/mathlib/mathlib-x86_64.hpp
@@ -0,0 +1,33 @@
+/*
+ *  mathlib-x86_64.hpp - Math library wrapper, x86-64 specific code
+ *  Code largely derived from GNU libc
+ *
+ *  Kheperix (C) 2003-2005 Gwenole Beauchesne
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef MATHLIB_X86_64_H
+#define MATHLIB_X86_64_H
+
+// 7.12.9.5  The lrint and llrint functions
+#if defined(__GNUC__)
+#define mathlib_lrint(x)													\
+({ long int __result;														\
+   __asm__ __volatile__ ("cvtsd2si %1, %0" : "=r" (__result) : "x" (x));	\
+  __result; })
+#endif
+
+#endif /* MATHLIB_X86_64_H */