USB Driver Compilation Error

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http://unix.stackexchange.com – I'm currently trying to compile a Linux USB UART driver, which is provided here: http://www.exar.com/connectivity/uart-and-bridging-solutions/usb-uarts/x... The driver consists of 2 header files and one large C file. These are the contents of the Makefile: obj-m := vizzini.o KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) EXTRA_CFLAGS := -DDEBUG=0 all: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install clean: rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions vtty This is the erro (HowTos)