Makefile: improved setup.dependencies target

Makefile

@@ -316,7 +316,10 @@ iso: check-root kernel syslinux initramfs squashfs
 iso/setup.dependencies:
 	@for PORT in $(foreach c,$(COLLECTIONS),$(PORTS_$(c))); do \
 		echo -n $$PORT": "; \
-		prt-get quickdep $$PORT; \
+		prt-get \
+			--no-std-config \
+			$(foreach c,$(COLLECTIONS),--config-append="prtdir $(PORTS_DIR)/$(c)") \
+			quickdep $$PORT; \
 	done > $@
 	
 # End of file