diff -uNr metis-5.0pre2/GKlib/trunk/Makefile metis-5.0pre2_patch/GKlib/trunk/Makefile
--- metis-5.0pre2/GKlib/trunk/Makefile	2007-03-27 17:34:29.000000000 -0400
+++ metis-5.0pre2_patch/GKlib/trunk/Makefile	2010-10-26 01:02:24.000000000 -0400
@@ -55,6 +55,23 @@
   LIBEXT = .lib
   EXEEXT = .exe
 else
+
+  #-------------------------------------------------------------------
+  # These defs are common among the GNU/GCC based systems
+  #-------------------------------------------------------------------
+  #Library creation information
+  AR = ar crv $@ 
+  RANLIB = ar -ts $@
+
+  #Compile input/output file specification
+  SOURCEFILE = -c $<
+  OUTPUTFILE = -o $@
+
+  # Standard file extensions
+  OBJEXT = .o
+  LIBEXT = .a
+  EXEEXT = 
+
   ifeq ($(systype),Linux)  
     ifeq ($(x86compiler),gcc) 
       #Compiler information
@@ -86,7 +103,7 @@
   ifeq ($(systype),Darwin)  
     #Compiler information
     CC = gcc
-    OPTFLAGS = -O6
+    OPTFLAGS = -O3 -shared
     COPTIONS = -DDARWIN -D_FILE_OFFSET_BITS=64 -Wall -std=c99 -pedantic
 
     #Linker information
@@ -95,7 +112,11 @@
 
     #Linker information
     LDOPTIONS =
-    LD = gcc
+    #LD = gcc
+    AR = gcc -shared  -dynamiclib -undefined dynamic_lookup -o $@
+    LD = $(CC) -dynamiclib -undefined dynamic_lookup
+    RANLIB =
+    LIBEXT = .dylib
   endif
 
 
@@ -121,22 +142,6 @@
     LD = gcc
   endif
 
-
-  #-------------------------------------------------------------------
-  # These defs are common among the GNU/GCC based systems
-  #-------------------------------------------------------------------
-  #Library creation information
-  AR = ar crv $@ 
-  RANLIB = ar -ts $@
-
-  #Compile input/output file specification
-  SOURCEFILE = -c $<
-  OUTPUTFILE = -o $@
-
-  # Standard file extensions
-  OBJEXT = .o
-  LIBEXT = .a
-  EXEEXT = 
 endif
 
 
diff -uNr metis-5.0pre2/Makefile.in metis-5.0pre2_patch/Makefile.in
--- metis-5.0pre2/Makefile.in	2007-04-08 00:01:04.000000000 -0400
+++ metis-5.0pre2_patch/Makefile.in	2010-10-26 01:01:50.000000000 -0400
@@ -105,8 +105,12 @@
   ifeq ($(systype),Darwin)
     #Compiler information
     CC = gcc
-    OPTFLAGS = -O6 
-    COPTIONS += -DDARWINPPC 
+    OPTFLAGS = -O3 -shared
+    COPTIONS += -DDARWIN
+    AR = gcc -shared  -dynamiclib -undefined dynamic_lookup -o $@
+    LD = $(CC) -dynamiclib -undefined dynamic_lookup
+    RANLIB =
+    LIBEXT = .dylib
   endif
 
   ifeq ($(systype),CYGWIN)