diff --git a/auto/Makefile b/auto/Makefile
index f6d9e4a..4a1544c 100644
--- a/auto/Makefile
+++ b/auto/Makefile
@@ -113,7 +113,7 @@ $(EXT)/.dummy: $(REGISTRY)/.dummy
 	@echo "Creating descriptors"
 	@echo "--------------------------------------------------------------------"
 	rm -rf $(EXT)
-	$(BIN)/update_ext.sh $(EXT) $(REGISTRY) $(BLACKLIST)
+	$(BIN)/update_ext.sh $(EXT) $(REGISTRY) $(BLACKLIST) $(CORE)
 	$(BIN)/$(FILTER)     $(EXT)
 ifeq ($(patsubst Darwin%,Darwin,$(SYSTEM)), Darwin)
 	find $(CORE) -maxdepth 1 -type f | grep -v VERSION | grep -v "~" | \
@@ -199,8 +199,7 @@ $(S.DEST)/glew.c: $(EXT)/.dummy $(SRC)/glew_init_hash.c
 	cp -f $(SRC)/glew_license.h $@
 	cat $(SRC)/glew_head.c >> $@
 	echo -e "\n#if !defined(_WIN32) || !defined(GLEW_MX)" >> $@
-	$(BIN)/make_def_fun.pl GL $(GL_CORE_SPEC) >> $@
-	$(BIN)/make_def_fun.pl GL $(GL_EXT_SPEC) >> $@
+	$(BIN)/make_def_fun.pl GL $(GL_CORE_SPEC) $(GL_EXT_SPEC) >> $@
 	echo -e "\n#endif /* !WIN32 || !GLEW_MX */" >> $@
 	echo -e "\n#if !defined(GLEW_MX)" >> $@;
 	echo -e "\nGLboolean __GLEW_VERSION_1_1 = GL_FALSE;" >> $@
diff --git a/auto/bin/parse_spec.pl b/auto/bin/parse_spec.pl
index efbf1bf..9476e7e 100755
--- a/auto/bin/parse_spec.pl
+++ b/auto/bin/parse_spec.pl
@@ -307,8 +307,10 @@ sub parse_spec($)
 
 my @speclist = ();
 my %extensions = ();
+my %fcn_in_core = ();
 
 my $ext_dir = shift;
+my $core_dir = shift;
 my $reg_http = "http://www.opengl.org/registry/specs/";
 
 # Take command line arguments or read list from file
@@ -320,6 +322,24 @@ if (@ARGV)
     @speclist = split "\n", (<>);
 }
 
+# Get functions moved to the GL core
+my %core_fnc = ();
+foreach my $spec (<$core_dir/GL_VERSION_*>)
+{
+    my $vsn = $spec;
+    $vsn =~ s/.*\/GL_VERSION_(\d+)_(\d+)/$1.$2/;
+
+    open SPEC, "<$spec";
+    while (<SPEC>)
+    {
+	if ($_ =~ qr/^(.+) ([a-z][a-z0-9_]*) \((.+)\)\s*(~.*)?$/i )
+	{
+	    $core_fnc{$2} = $vsn;
+	}
+    }
+    close SPEC;
+}
+
 foreach my $spec (sort @speclist)
 {
     my ($extname, $extnames, $tokens, $functions) = parse_spec($spec);
@@ -371,7 +391,13 @@ foreach my $spec (sort @speclist)
         {
             if ($function =~ /^$prefix.*/i)
             {
-                print EXT "\t" . ${$functions}{$function}{rtype} . " " . $function . " (" . ${$functions}{$function}{parms} . ")" . "\n";
+		my $deleter = "";
+
+		if ($core_fnc{$function})
+		{
+		    $deleter = " ~ " . $core_fnc{$function};
+		}
+                print EXT "\t" . ${$functions}{$function}{rtype} . " " . $function . " (" . ${$functions}{$function}{parms} . ")" . $deleter . "\n";
             }
         }
         close EXT;
diff --git a/auto/bin/update_ext.sh b/auto/bin/update_ext.sh
index e990a21..f350cbc 100755
--- a/auto/bin/update_ext.sh
+++ b/auto/bin/update_ext.sh
@@ -20,6 +20,6 @@ if [ ! -d $1 ] ; then
 
 # Parse each of the extensions in the registry
     find $2 -name doc -type d -prune -o -name "*.txt" -print | \
-	grep -v -f $3 | sort | bin/parse_spec.pl $1
+	grep -v -f $3 | sort | bin/parse_spec.pl $1 $4
 
 fi