diff --git a/auto/Makefile b/auto/Makefile
index eb4037b..3e04caf 100644
--- a/auto/Makefile
+++ b/auto/Makefile
@@ -38,8 +38,10 @@ ext: $(EXT)/.dummy
 
 $(REGISTRY)/.dummy: $(BIN)/update_registry.sh
 	$(BIN)/update_registry.sh $(REGISTRY) $(REGISTRY_URL)
-	sed -e '7s/\<ATI_/GL_ATI_/' $(REGISTRY)/ATI/texture_env_combine3.txt > tmp
-	mv tmp $(REGISTRY)/ATI/texture_env_combine3.txt
+	head -6 $(REGISTRY)/ATI/texture_env_combine3.txt > tmp
+	tail +7 $(REGISTRY)/ATI/texture_env_combine3.txt | \
+	perl -e 's/ATI\_/GL\_ATI\_/g;' -p >> tmp
+	mv -f tmp $(REGISTRY)/ATI/texture_env_combine3.txt
 	touch $@
 
 $(EXT)/.dummy: $(REGISTRY)/.dummy
@@ -100,8 +102,8 @@ $(S.DEST)/glew.c: $(EXT)/.dummy
 	$(BIN)/make_list.pl $(EXT)/GLX_* >> $@
 	cat $(SRC)/glew_post.c >> $@
 	$(BIN)/fix_OML_sync_control.sh $@
-	sed -e "s/GLEW_VERSION_STRING/$(GLEW_MAJOR)\.$(GLEW_MINOR)\.$(GLEW_MICRO)/g" $@ > tmp
-	mv tmp $@
+	perl -e "s/GLEW_VERSION_STRING/$(GLEW_MAJOR)\.$(GLEW_MINOR)\.$(GLEW_MICRO)/g" -pi.bak $@
+	rm -f $@.bak
 
 $(S.DEST)/glewinfo.c: $(EXT)/.dummy
 	cp -f $(SRC)/glewinfo_pre.c $@
diff --git a/auto/bin/update_ext.sh b/auto/bin/update_ext.sh
index 7ab8dd9..a67ce2c 100755
--- a/auto/bin/update_ext.sh
+++ b/auto/bin/update_ext.sh
@@ -37,12 +37,12 @@ if [ ! -d $1 ] ; then
 # fix GL_NV_occlusion_query and GL_HP_occlusion_test
     grep -v '_HP' $1/GL_NV_occlusion_query > tmp
     mv tmp $1/GL_NV_occlusion_query
-    sed -e's/OCCLUSION_TEST_HP.*/OCCLUSION_TEST_HP 0x8165/' \
-	$1/GL_HP_occlusion_test > tmp
-    mv tmp $1/GL_HP_occlusion_test
-    sed -e's/OCCLUSION_TEST_RESULT_HP.*/OCCLUSION_TEST_RESULT_HP 0x8166/' \
-	$1/GL_HP_occlusion_test > tmp
-    mv tmp $1/GL_HP_occlusion_test
+    perl -e's/OCCLUSION_TEST_HP.*/OCCLUSION_TEST_HP 0x8165/' -pi.bak \
+	$1/GL_HP_occlusion_test
+    rm -f $1/GL_HP_occlusion_test.bak
+    perl -e's/OCCLUSION_TEST_RESULT_HP.*/OCCLUSION_TEST_RESULT_HP 0x8166/' -pi.bak \
+	$1/GL_HP_occlusion_test
+    rm -f $1/GL_HP_occlusion_test.bak
 
 # fix WGL_ATI_pixel_format_float
     cat >> $1/WGL_ATI_pixel_format_float <<EOT
@@ -106,14 +106,14 @@ EOT
     rm -f $1/GL_SUN_multi_draw_arrays
 
 # change variable names in GL_ARB_vertex_shader
-    sed -e 's/v0/x/g' $1/GL_ARB_vertex_shader > tmp
-    mv tmp $1/GL_ARB_vertex_shader
-    sed -e 's/v1/y/g' $1/GL_ARB_vertex_shader > tmp
-    mv tmp $1/GL_ARB_vertex_shader
-    sed -e 's/v2/z/g' $1/GL_ARB_vertex_shader > tmp
-    mv tmp $1/GL_ARB_vertex_shader
-    sed -e 's/v3/w/g' $1/GL_ARB_vertex_shader > tmp
-    mv tmp $1/GL_ARB_vertex_shader
+    perl -e 's/v0/x/g' -pi.bak $1/GL_ARB_vertex_shader
+    rm -f $1/GL_ARB_vertex_shader.bak
+    perl -e 's/v1/y/g' -pi.bak $1/GL_ARB_vertex_shader
+    rm -f $1/GL_ARB_vertex_shader.bak
+    perl -e 's/v2/z/g' -pi.bak $1/GL_ARB_vertex_shader
+    rm -f $1/GL_ARB_vertex_shader.bak
+    perl -e 's/v3/w/g' -pi.bak $1/GL_ARB_vertex_shader
+    rm -f $1/GL_ARB_vertex_shader.bak
 
 # remove triplicates in GL_ARB_shader_objects, GL_ARB_fragment_shader, 
 # and GL_ARB_vertex_shader
@@ -136,8 +136,8 @@ EOT
 # fix bugs in GL_ARB_vertex_shader
     grep -v "GL_FLOAT" $1/GL_ARB_vertex_shader > tmp
     mv tmp $1/GL_ARB_vertex_shader
-    sed -e 's/handle /GLhandleARB /g' $1/GL_ARB_vertex_shader > tmp
-    mv tmp $1/GL_ARB_vertex_shader
+    perl -e 's/handle /GLhandleARB /g' -pi.bak $1/GL_ARB_vertex_shader
+    rm -f $1/GL_ARB_vertex_shader.bak
 
 # fix bugs in GL_ARB_shader_objects
     grep -v "GL_FLOAT" $1/GL_ARB_shader_objects > tmp