use the new gnuconfig stuff

package/findutils/findutils.mk

@@ -18,6 +18,7 @@ findutils-source: $(DL_DIR)/$(FINDUTILS_SOURCE)
 
 $(FINDUTILS_DIR)/.unpacked: $(DL_DIR)/$(FINDUTILS_SOURCE)
 	$(FINDUTILS_CAT) $(DL_DIR)/$(FINDUTILS_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
+	$(CONFIG_UPDATE) $(FINDUTILS_DIR)
 	touch $(FINDUTILS_DIR)/.unpacked
 
 $(FINDUTILS_DIR)/.configured: $(FINDUTILS_DIR)/.unpacked

package/jpeg/jpeg.mk

@@ -32,9 +32,7 @@ jpeg-source: $(DL_DIR)/$(JPEG_SOURCE)
 
 $(JPEG_DIR)/.unpacked: $(DL_DIR)/$(JPEG_SOURCE)
 	$(JPEG_CAT) $(DL_DIR)/$(JPEG_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
-	# The config.guess distributed with the package is not able
-	# to handle cross compilation.  Use the one from binutils.
-	cp $(BINUTILS_DIR)/config.guess $(JPEG_DIR)/
+	$(CONFIG_UPDATE) $(JPEG_DIR)
 	touch $(JPEG_DIR)/.unpacked
 
 $(JPEG_DIR)/.configured: $(JPEG_DIR)/.unpacked

package/ncurses/ncurses.mk

@@ -36,6 +36,7 @@ $(NCURSES_DIR)/.dist: $(DL_DIR)/$(NCURSES_SOURCE)
 	$(SED) 's~\$$srcdir/shlib tic\$$suffix~/usr/bin/tic~' \
 		$(NCURSES_DIR)/misc/run_tic.in
 	toolchain/patch-kernel.sh $(NCURSES_DIR) package/ncurses/ ncurses\*.patch
+	$(CONFIG_UPDATE) $(NCURSES_DIR)
 	touch  $(NCURSES_DIR)/.dist
 
 $(NCURSES_DIR)/.configured: $(NCURSES_DIR)/.dist