diff --git a/SheepShaver/src/Unix/Makefile.in b/SheepShaver/src/Unix/Makefile.in
index 820b3863..e546cccf 100644
--- a/SheepShaver/src/Unix/Makefile.in
+++ b/SheepShaver/src/Unix/Makefile.in
@@ -24,6 +24,7 @@ LIBS = @LIBS@
 SYSSRCS = @SYSSRCS@
 CPUSRCS = @CPUSRCS@
 MONSRCS = @MONSRCS@
+PERL = @PERL@
 USE_DYNGEN = @USE_DYNGEN@
 DYNGENSRCS = @DYNGENSRCS@
 DYNGEN_CC = @DYNGEN_CC@
@@ -142,7 +143,7 @@ $(OBJ_DIR)/%.o : %.S
 
 # Kheperix CPU emulator
 kpxsrcdir = ../kpx_cpu/src
-GENEXEC   = $(kpxsrcdir)/cpu/ppc/genexec.pl
+GENEXECPL = $(kpxsrcdir)/cpu/ppc/genexec.pl
 DYNGEN    = dyngen$(EXEEXT)
 
 ifeq ($(USE_DYNGEN),yes)
@@ -167,8 +168,8 @@ $(OBJ_DIR)/sheepshaver_glue.o $(OBJ_DIR)/ppc-cpu.o $(OBJ_DIR)/ppc-decode.o $(OBJ
 endif
 
 $(OBJ_DIR)/ppc-execute.o: ppc-execute-impl.cpp
-ppc-execute-impl.cpp: $(kpxsrcdir)/cpu/ppc/ppc-decode.cpp $(GENEXEC) $(DYNGENDEPS)
-	$(CPP) $(CPPFLAGS) -DGENEXEC $< | $(GENEXEC) > $@
+ppc-execute-impl.cpp: $(kpxsrcdir)/cpu/ppc/ppc-decode.cpp $(GENEXECPL) $(DYNGENDEPS)
+	$(CPP) $(CPPFLAGS) -DGENEXEC $< | $(PERL) $(GENEXECPL) > $@
 
 # PowerPC CPU tester
 TESTSRCS_ = mathlib/ieeefp.cpp cpu/ppc/ppc-cpu.cpp cpu/ppc/ppc-decode.cpp cpu/ppc/ppc-execute.cpp cpu/ppc/ppc-translate.cpp test/test-powerpc.cpp $(MONSRCS) vm_alloc.cpp
diff --git a/SheepShaver/src/Unix/configure.ac b/SheepShaver/src/Unix/configure.ac
index fe8bd0f4..3d6502ce 100644
--- a/SheepShaver/src/Unix/configure.ac
+++ b/SheepShaver/src/Unix/configure.ac
@@ -48,7 +48,8 @@ AC_PROG_CXX
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
 AC_PROG_EGREP
-AC_CHECK_PROGS(FILE, [file false])
+AC_PATH_PROGS(FILE, [file false])
+AC_PATH_PROG(PERL, [perl])
 
 dnl Check for PowerPC target CPU.
 HAVE_PPC=no
@@ -305,7 +306,7 @@ AC_CHECK_FUNCS(sigaction signal)
 AC_CHECK_FUNCS(mmap mprotect munmap)
 AC_CHECK_FUNCS(vm_allocate vm_deallocate vm_protect)
 AC_CHECK_FUNCS(posix_memalign memalign valloc)
-AC_CHECK_FUNCS(exp2f log2f exp2 log2)
+AC_CHECK_FUNCS(exp2f log2f exp2 log2 trunc)
 
 dnl Darwin seems to define mach_task_self() instead of task_self().
 AC_CHECK_FUNCS(mach_task_self task_self)
@@ -1070,7 +1071,7 @@ if [[ "x$EMULATED_PPC" = "xyes" ]]; then
         AC_CHECK_HEADERS(mmintrin.h xmmintrin.h emmintrin.h)
         ;;
       esac
-      DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -finline-limit=10000"
+      DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -finline-limit=10000 -g0"
       if [[ "x$HAVE_GCC30" = "xyes" ]]; then
         DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -fno-reorder-blocks -fno-optimize-sibling-calls"
       fi
@@ -1123,6 +1124,7 @@ if [[ "x$WANT_JIT" = "xyes" ]]; then
 fi
 
 dnl Generate Makefile.
+AC_SUBST(PERL)
 AC_SUBST(USE_DYNGEN, [$ac_cv_use_dyngen])
 AC_SUBST(DYNGENSRCS)
 AC_SUBST(DYNGEN_CC)
diff --git a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp
index 7d4d913a..da627dda 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp
@@ -24,7 +24,6 @@
 #include <math.h>
 #include <time.h>
 
-#include "mathlib/ieeefp.hpp"
 #include "cpu/vm.hpp"
 #include "cpu/ppc/ppc-cpu.hpp"
 #include "cpu/ppc/ppc-bitfields.hpp"
diff --git a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
index 00b63d06..c27ee2b6 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
@@ -22,6 +22,7 @@
 #define PPC_OPERATIONS_H
 
 #include <math.h>
+#include "mathlib/ieeefp.hpp"
 
 /**
  *	Define an unary/binary/trinary operation
diff --git a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.cpp b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.cpp
index 476f8570..5e0ebab0 100755
--- a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.cpp
+++ b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.cpp
@@ -108,3 +108,21 @@ int fesetround(int round)
 
 	return 0;
 }
+
+// Truncate double value
+#ifndef HAVE_TRUNC
+#define HAVE_TRUNC
+double trunc(double x)
+{
+	volatile unsigned short int cw;
+	volatile unsigned short int cwtmp;
+	double value;
+
+	__asm__ __volatile__("fnstcw %0" : "=m" (cw));
+	cwtmp = (cw & 0xf3ff) | 0x0c00; /* toward zero */
+	__asm__ __volatile__("fldcw %0" : : "m" (cwtmp));
+	__asm__ __volatile__("frndint" : "=t" (value) : "0" (x));
+	__asm__ __volatile__("fldcw %0" : : "m" (cw));
+	return value;
+}
+#endif
diff --git a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.hpp b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.hpp
index 0ce79030..682e2b50 100755
--- a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.hpp
+++ b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-i386.hpp
@@ -1,7 +1,8 @@
 /*
- *  ieeefp-i386.hpp - Access to FPU environment, x86 specific code
+ *  ieeefp-i386.hpp - IEEE754 Floating-Point Math library, x86 specific code
  *
  *  Kheperix (C) 2003-2005 Gwenole Beauchesne
+ *  Code derived from the GNU C Library
  *
  *  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
@@ -18,8 +19,11 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef IEEEFP_FENV_I386_H
-#define IEEEFP_FENV_I386_H
+#ifndef IEEEFP_I386_H
+#define IEEEFP_I386_H
+
+// 7.6  Floating-point environment <fenv.h>
+#ifndef HAVE_FENV_H
 
 // Exceptions
 enum {
@@ -49,4 +53,25 @@ enum {
 #define FE_TOWARDZERO	FE_TOWARDZERO
 };
 
-#endif /* IEEEFP_FENV_I386_H */
+#endif
+
+// 7.12.14  Comparison macros
+#if defined(__GNUC__)
+#ifndef isless
+#define isless(x, y)														\
+({ register char __result;													\
+   __asm__ ("fucompp; fnstsw; testb $0x45, %%ah; setz %%al"					\
+			: "=a" (__result) : "u" (x), "t" (y) : "cc", "st", "st(1)");	\
+   __result; })
+#endif
+
+#ifndef isgreater
+#define isgreater(x, y)														\
+({ register char __result;													\
+   __asm__ ("fucompp; fnstsw; testb $0x45, %%ah; setz %%al"					\
+			: "=a" (__result) : "u" (y), "t" (x) : "cc", "st", "st(1)");	\
+   __result; })
+#endif
+#endif
+
+#endif /* IEEEFP_I386_H */
diff --git a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp.hpp b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp.hpp
index 6c89c2e2..4053b055 100755
--- a/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp.hpp
+++ b/SheepShaver/src/kpx_cpu/src/mathlib/ieeefp.hpp
@@ -1,5 +1,5 @@
 /*
- *  ieeefp.hpp - Access to FPU environment
+ *  ieeefp.hpp - IEEE754 Floating-Point Math library
  *
  *  Kheperix (C) 2003-2005 Gwenole Beauchesne
  *
@@ -18,21 +18,35 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef IEEEFP_FENV_H
-#define IEEEFP_FENV_H
-
-#ifdef HAVE_FENV_H
-#include <fenv.h>
-#else
+#ifndef IEEEFP_H
+#define IEEEFP_H
 
 // Arch-dependent definitions
 #if defined(__i386__)
 #include "mathlib/ieeefp-i386.hpp"
 #endif
 
+#ifdef HAVE_FENV_H
+#include <fenv.h>
+#else
+
 // Rounding control
 extern "C" int fegetround(void);
 extern "C" int fesetround(int);
 
 #endif /* FENV_H */
-#endif /* IEEEFP_FENV_H */
+
+// Rounding
+#ifndef HAVE_TRUNC
+extern "C" double trunc(double);
+#endif
+
+// Comparison macros
+#ifndef isless
+#define isless(x, y) ((x) < (y))
+#endif
+#ifndef isgreater
+#define isgreater(x, y) ((x) > (y))
+#endif
+
+#endif /* IEEEFP_H */