diff -uNr geant4.9.1.p01.ORIG/config/sys/Darwin-g++.gmk geant4.9.1.p01/config/sys/Darwin-g++.gmk
--- geant4.9.1.p01.ORIG/config/sys/Darwin-g++.gmk	2008-01-15 19:06:47.000000000 +0900
+++ geant4.9.1.p01/config/sys/Darwin-g++.gmk	2008-03-20 01:09:13.000000000 +0900
@@ -27,10 +27,16 @@
     FCFLAGS   += -pg
     CCFLAGS   += -pg
   endif
-  FC := gfortran
-  FCFLAGS += -fno-automatic -fno-backslash -fno-second-underscore
+  ifeq ($(shell which gfortran 2>&1 | grep -c 'no gfortran'),0)
+    FC := gfortran
+    FCFLAGS += -fno-automatic -fno-backslash -fno-second-underscore
+    FCLIBS := -lgfortran -lgfortranbegin -lnsl
+  else
+    FC := g77
+    FCFLAGS += -fno-automatic -fno-backslash -fno-second-underscore
+    FCLIBS := -lg2c -lnsl
+  endif
   LDFLAGS += -bind_at_load
-  FCLIBS := -lg2c -lnsl
   SHEXT   := dylib
   ifndef X11FLAGS
     X11FLAGS  := -I/usr/include/X11/extensions -I/usr/include/X11
diff -uNr geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsFreeVector.cc geant4.9.1.p01/source/global/management/src/G4PhysicsFreeVector.cc
--- geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsFreeVector.cc	2006-06-30 04:04:10.000000000 +0900
+++ geant4.9.1.p01/source/global/management/src/G4PhysicsFreeVector.cc	2008-03-20 02:35:05.000000000 +0900
@@ -44,7 +44,7 @@
 //--------------------------------------------------------------------
 
 #include "G4PhysicsFreeVector.hh"
-
+#include <climits>
 
 G4PhysicsFreeVector::G4PhysicsFreeVector()
 {
diff -uNr geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLinearVector.cc geant4.9.1.p01/source/global/management/src/G4PhysicsLinearVector.cc
--- geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLinearVector.cc	2006-06-30 04:04:13.000000000 +0900
+++ geant4.9.1.p01/source/global/management/src/G4PhysicsLinearVector.cc	2008-03-20 02:58:52.000000000 +0900
@@ -45,6 +45,7 @@
 //--------------------------------------------------------------------
 
 #include "G4PhysicsLinearVector.hh"
+#include <climits>
 
 G4PhysicsLinearVector::G4PhysicsLinearVector()
   : dBin(0.), baseBin(0.)
diff -uNr geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLnVector.cc geant4.9.1.p01/source/global/management/src/G4PhysicsLnVector.cc
--- geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLnVector.cc	2006-06-30 04:04:15.000000000 +0900
+++ geant4.9.1.p01/source/global/management/src/G4PhysicsLnVector.cc	2008-03-20 02:59:32.000000000 +0900
@@ -41,6 +41,7 @@
 // --------------------------------------------------------------
 
 #include "G4PhysicsLnVector.hh"
+#include <climits>
 
 G4PhysicsLnVector::G4PhysicsLnVector()
   : dBin(0.), baseBin(0.)
diff -uNr geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLogVector.cc geant4.9.1.p01/source/global/management/src/G4PhysicsLogVector.cc
--- geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsLogVector.cc	2006-06-30 04:04:17.000000000 +0900
+++ geant4.9.1.p01/source/global/management/src/G4PhysicsLogVector.cc	2008-03-20 03:00:04.000000000 +0900
@@ -44,6 +44,7 @@
 // --------------------------------------------------------------
 
 #include "G4PhysicsLogVector.hh"
+#include <climits>
 
 G4PhysicsLogVector::G4PhysicsLogVector()
   : dBin(0.), baseBin(0.)
diff -uNr geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsOrderedFreeVector.cc geant4.9.1.p01/source/global/management/src/G4PhysicsOrderedFreeVector.cc
--- geant4.9.1.p01.ORIG/source/global/management/src/G4PhysicsOrderedFreeVector.cc	2006-06-30 04:04:20.000000000 +0900
+++ geant4.9.1.p01/source/global/management/src/G4PhysicsOrderedFreeVector.cc	2008-03-20 03:00:51.000000000 +0900
@@ -48,6 +48,7 @@
 ////////////////////////////////////////////////////////////////////////
 
 #include "G4PhysicsOrderedFreeVector.hh"
+#include <climits>
 
 /////////////////////////
 // Class Implementation
diff -uNr geant4.9.1.p01.ORIG/source/graphics_reps/src/HepPolyhedron.cc geant4.9.1.p01/source/graphics_reps/src/HepPolyhedron.cc
--- geant4.9.1.p01.ORIG/source/graphics_reps/src/HepPolyhedron.cc	2008-01-30 19:45:58.000000000 +0900
+++ geant4.9.1.p01/source/graphics_reps/src/HepPolyhedron.cc	2008-03-20 03:11:49.000000000 +0900
@@ -66,6 +66,7 @@
 #include <CLHEP/Geometry/Vector3D.h>
 
 #include <cmath>
+#include <cstdlib>
 
 using namespace HepGeom;
 using CLHEP::perMillion;
diff -uNr geant4.9.1.p01.ORIG/source/processes/hadronic/models/neutron_hp/src/G4NeutronHPInelasticBaseFS.cc geant4.9.1.p01/source/processes/hadronic/models/neutron_hp/src/G4NeutronHPInelasticBaseFS.cc
--- geant4.9.1.p01.ORIG/source/processes/hadronic/models/neutron_hp/src/G4NeutronHPInelasticBaseFS.cc	2007-06-22 18:23:48.000000000 +0900
+++ geant4.9.1.p01/source/processes/hadronic/models/neutron_hp/src/G4NeutronHPInelasticBaseFS.cc	2008-03-20 02:53:29.000000000 +0900
@@ -34,6 +34,7 @@
 #include "G4Alpha.hh"
 #include "G4Electron.hh"
 #include "G4NeutronHPDataUsed.hh"
+#include <climits>
 
 void G4NeutronHPInelasticBaseFS::InitGammas(G4double AR, G4double ZR)
 {
diff -uNr geant4.9.1.p01.ORIG/source/processes/management/src/G4ProcessManager.cc geant4.9.1.p01/source/processes/management/src/G4ProcessManager.cc
--- geant4.9.1.p01.ORIG/source/processes/management/src/G4ProcessManager.cc	2007-11-29 02:47:57.000000000 +0900
+++ geant4.9.1.p01/source/processes/management/src/G4ProcessManager.cc	2008-03-20 02:51:34.000000000 +0900
@@ -48,6 +48,7 @@
 #include <iomanip>
 #include "G4ProcessTable.hh"
 #include "G4ios.hh"
+#include <climits>
 
 
 // ---------------------------------