diff -Naur ../systemc-2.1.v1/src/sysc/datatypes/fx/sc_context.h src/sysc/datatypes/fx/sc_context.h
--- ../systemc-2.1.v1/src/sysc/datatypes/fx/sc_context.h	2005-03-31 23:22:06.000000000 +0200
+++ src/sysc/datatypes/fx/sc_context.h	2006-05-23 09:22:42.931661194 +0200
@@ -227,6 +227,7 @@
 {
     // this method should never be called
     SC_REPORT_FATAL( sc_core::SC_ID_INTERNAL_ERROR_, "should never be called" );
+    return NULL;
 }
 
 
diff -Naur ../systemc-2.1.v1/src/sysc/datatypes/fx/scfx_rep.h src/sysc/datatypes/fx/scfx_rep.h
--- ../systemc-2.1.v1/src/sysc/datatypes/fx/scfx_rep.h	2005-03-31 23:22:30.000000000 +0200
+++ src/sysc/datatypes/fx/scfx_rep.h	2006-05-23 09:23:18.483693635 +0200
@@ -88,6 +88,23 @@
 };
 
 
+void multiply( scfx_rep&, const scfx_rep&, const scfx_rep&,
+	       int = SC_DEFAULT_MAX_WL_ );
+
+scfx_rep*  neg_scfx_rep( const scfx_rep& );
+scfx_rep* mult_scfx_rep( const scfx_rep&, const scfx_rep&,
+			 int = SC_DEFAULT_MAX_WL_ );
+scfx_rep*  div_scfx_rep( const scfx_rep&, const scfx_rep&,
+			 int = SC_DEFAULT_DIV_WL_ );
+scfx_rep*  add_scfx_rep( const scfx_rep&, const scfx_rep&,
+			 int = SC_DEFAULT_MAX_WL_ );
+scfx_rep*  sub_scfx_rep( const scfx_rep&, const scfx_rep&,
+			 int = SC_DEFAULT_MAX_WL_ );
+scfx_rep*  lsh_scfx_rep( const scfx_rep&, int );
+scfx_rep*  rsh_scfx_rep( const scfx_rep&, int );
+
+int        cmp_scfx_rep( const scfx_rep&, const scfx_rep& );
+
 // ----------------------------------------------------------------------------
 //  CLASS : scfx_rep
 //
@@ -148,18 +165,13 @@
 
     void operator = ( const scfx_rep& );
 
-    friend void multiply( scfx_rep&, const scfx_rep&, const scfx_rep&,
-			  int = SC_DEFAULT_MAX_WL_ );
+    friend void multiply( scfx_rep&, const scfx_rep&, const scfx_rep&, int);
 
     friend scfx_rep*  neg_scfx_rep( const scfx_rep& );
-    friend scfx_rep* mult_scfx_rep( const scfx_rep&, const scfx_rep&,
-				     int = SC_DEFAULT_MAX_WL_ );
-    friend scfx_rep*  div_scfx_rep( const scfx_rep&, const scfx_rep&,
-				     int = SC_DEFAULT_DIV_WL_ );
-    friend scfx_rep*  add_scfx_rep( const scfx_rep&, const scfx_rep&,
-				     int = SC_DEFAULT_MAX_WL_ );
-    friend scfx_rep*  sub_scfx_rep( const scfx_rep&, const scfx_rep&,
-				     int = SC_DEFAULT_MAX_WL_ );
+    friend scfx_rep* mult_scfx_rep( const scfx_rep&, const scfx_rep&, int);
+    friend scfx_rep*  div_scfx_rep( const scfx_rep&, const scfx_rep&, int);
+    friend scfx_rep*  add_scfx_rep( const scfx_rep&, const scfx_rep&, int);
+    friend scfx_rep*  sub_scfx_rep( const scfx_rep&, const scfx_rep&, int);
     friend scfx_rep*  lsh_scfx_rep( const scfx_rep&, int );
     friend scfx_rep*  rsh_scfx_rep( const scfx_rep&, int );
 
diff -Naur ../systemc-2.1.v1/src/sysc/datatypes/int/sc_signed.h src/sysc/datatypes/int/sc_signed.h
--- ../systemc-2.1.v1/src/sysc/datatypes/int/sc_signed.h	2005-05-24 23:56:50.000000000 +0200
+++ src/sysc/datatypes/int/sc_signed.h	2006-05-23 09:23:20.472192059 +0200
@@ -471,6 +471,76 @@
 ::std::istream&
 operator >> ( ::std::istream&, sc_signed_subref& );
 
+// Helper functions forward declarations
+sc_signed add_signed_friend(small_type us, 
+			    int unb,
+			    int und, 
+			    const unsigned long *ud, 
+			    small_type vs, 
+			    int vnb,
+			    int vnd,
+			    const unsigned long *vd);
+
+sc_signed sub_signed_friend(small_type us, 
+			    int unb,
+			    int und, 
+			    const unsigned long *ud, 
+			    small_type vs, 
+			    int vnb,
+			    int vnd, 
+			    const unsigned long *vd);
+  
+sc_signed mul_signed_friend(small_type s,
+			    int unb,
+			    int und, 
+			    const unsigned long *ud, 
+			    int vnb,
+			    int vnd,
+			    const unsigned long *vd);
+
+sc_signed div_signed_friend(small_type s,
+			    int unb,
+			    int und, 
+			    const unsigned long *ud, 
+			    int vnb,
+			    int vnd,
+			    const unsigned long *vd);
+
+sc_signed mod_signed_friend(small_type us,
+			    int unb,
+			    int und, 
+			    const unsigned long *ud, 
+			    int vnb,
+			    int vnd,
+			    const unsigned long *vd);
+  
+sc_signed and_signed_friend(small_type us, 
+			    int unb, 
+			    int und, 
+			    const unsigned long *ud, 
+			    small_type vs,
+			    int vnb, 
+			    int vnd,
+			    const unsigned long *vd);
+  
+sc_signed or_signed_friend(small_type us, 
+			   int unb, 
+			   int und, 
+			   const unsigned long *ud, 
+			   small_type vs,
+			   int vnb, 
+			   int vnd,
+			   const unsigned long *vd);
+  
+sc_signed xor_signed_friend(small_type us, 
+			    int unb, 
+			    int und, 
+			    const unsigned long *ud, 
+			    small_type vs,
+			    int vnb, 
+			    int vnd,
+			    const unsigned long *vd);
+
 
 // ----------------------------------------------------------------------------
 //  CLASS : sc_signed
diff -Naur ../systemc-2.1.v1/src/sysc/datatypes/int/sc_unsigned.h src/sysc/datatypes/int/sc_unsigned.h
--- ../systemc-2.1.v1/src/sysc/datatypes/int/sc_unsigned.h	2005-05-24 23:57:06.000000000 +0200
+++ src/sysc/datatypes/int/sc_unsigned.h	2006-05-23 09:23:22.880584570 +0200
@@ -470,6 +470,87 @@
 operator >> ( ::std::istream&, sc_unsigned_subref& );
 
 
+// Helper functions forward declarations
+int compare_unsigned(small_type us, 
+		     int unb,
+		     int und, 
+		     const unsigned long *ud, 
+		     small_type vs, 
+		     int vnb,
+		     int vnd,
+		     const unsigned long *vd,
+		     small_type if_u_signed = 0,
+		     small_type if_v_signed = 0);
+  
+sc_unsigned add_unsigned_friend(small_type us, 
+				int unb,
+				int und, 
+				const unsigned long *ud, 
+				small_type vs, 
+				int vnb,
+				int vnd,
+				const unsigned long *vd);
+  
+sc_unsigned sub_unsigned_friend(small_type us, 
+				int unb,
+				int und, 
+				const unsigned long *ud, 
+				small_type vs, 
+				int vnb,
+				int vnd, 
+				const unsigned long *vd);
+  
+sc_unsigned mul_unsigned_friend(small_type s,
+				int unb,
+				int und, 
+				const unsigned long *ud, 
+				int vnb,
+				int vnd,
+				const unsigned long *vd);
+  
+sc_unsigned div_unsigned_friend(small_type s,
+				int unb,
+				int und, 
+				const unsigned long *ud, 
+				int vnb,
+				int vnd,
+				const unsigned long *vd);
+  
+sc_unsigned mod_unsigned_friend(small_type us,
+				int unb,
+				int und, 
+				const unsigned long *ud, 
+				int vnb,
+				int vnd,
+				const unsigned long *vd);
+  
+sc_unsigned and_unsigned_friend(small_type us, 
+				int unb, 
+				int und, 
+				const unsigned long *ud, 
+				small_type vs,
+				int vnb, 
+				int vnd,
+				const unsigned long *vd);
+  
+sc_unsigned or_unsigned_friend(small_type us, 
+			       int unb, 
+			       int und, 
+			       const unsigned long *ud, 
+			       small_type vs,
+			       int vnb, 
+			       int vnd,
+			       const unsigned long *vd);
+
+sc_unsigned xor_unsigned_friend(small_type us, 
+				int unb, 
+				int und, 
+				const unsigned long *ud, 
+				small_type vs,
+				int vnb, 
+				int vnd,
+				const unsigned long *vd);
+
 // ----------------------------------------------------------------------------
 //  CLASS : sc_unsigned
 //
@@ -1364,8 +1445,8 @@
                               int vnb,
                               int vnd,
                               const unsigned long *vd,
-                              small_type if_u_signed = 0,
-                              small_type if_v_signed = 0);
+                              small_type if_u_signed,
+                              small_type if_v_signed);
   
   friend sc_unsigned add_unsigned_friend(small_type us, 
                                          int unb,
diff -Naur ../systemc-2.1.v1/src/sysc/datatypes/misc/sc_value_base.h src/sysc/datatypes/misc/sc_value_base.h
--- ../systemc-2.1.v1/src/sysc/datatypes/misc/sc_value_base.h	2005-04-19 22:23:18.000000000 +0200
+++ src/sysc/datatypes/misc/sc_value_base.h	2006-05-23 09:23:24.402200759 +0200
@@ -57,6 +57,8 @@
 class sc_value_base 
 {
     friend class sc_concatref;
+  public:
+    virtual ~sc_value_base() {}
   private: 
     virtual void concat_clear_data( bool to_ones=false );
     virtual bool concat_get_ctrl( unsigned long* dst_p, int low_i ) const;
diff -Naur ../systemc-2.1.v1/src/sysc/kernel/sc_process_host.h src/sysc/kernel/sc_process_host.h
--- ../systemc-2.1.v1/src/sysc/kernel/sc_process_host.h	2005-03-31 23:21:24.000000000 +0200
+++ src/sysc/kernel/sc_process_host.h	2006-05-23 09:23:30.094764872 +0200
@@ -73,6 +73,8 @@
 		spm_exit = 0
 	};
     virtual void signal(sc_thread_handle thread_p, int type);  
+
+    virtual ~sc_process_monitor() {}
 };
 
 // -----------------------------------------------------------------------------
diff -Naur ../systemc-2.1.v1/src/sysc/kernel/sc_process_int.h src/sysc/kernel/sc_process_int.h
--- ../systemc-2.1.v1/src/sysc/kernel/sc_process_int.h	2005-03-31 23:21:26.000000000 +0200
+++ src/sysc/kernel/sc_process_int.h	2006-05-23 09:23:31.756345757 +0200
@@ -290,6 +290,9 @@
 //  Process class for SC_THREADs.
 // ----------------------------------------------------------------------------
 
+void sc_thread_cor_fn( void* );
+void sc_cthread_cor_fn( void* );
+
 class sc_thread_process
 : public sc_process_b
 {
diff -Naur ../tmp/systemc-2.1.v1/configure.in configure.in 
--- ../tmp/systemc-2.1.v1/configure.in  2005-04-12 03:19:25.000000000 +0530
+++ configure.in        2007-02-11 15:49:06.000000000 +0530
@@ -128,6 +128,23 @@
        AS=as
         QT_ARCH="iX86"
         ;;
+    i386-pc-macosx)
+        case "$CXX_COMP" in
+            c++ | g++)
+                EXTRA_CXXFLAGS="-Wall"
+                DEBUG_CXXFLAGS="-g"
+                OPT_CXXFLAGS="-O3"
+                TARGET_ARCH="macosx"
+               CC="$CXX"
+               CFLAGS="$EXTRA_CXXFLAGS $OPT_CXXFLAGS"
+                ;;
+            *)
+                AC_MSG_ERROR("sorry...compiler not supported")
+               ;;
+        esac
+       AS=as
+        QT_ARCH="iX86"
+        ;;
     *cygwin*)
         case "$CXX_COMP" in
             c++ | g++)