Cross compiling hello world module

Question

I am trying to cross compile a simple hello world program. The cross compiler I am using is for Buildroot Linux on a RPI4. I am trying to do the compilation on my Ubuntu machine. I get this error:

make[2]: *** No rule to make target '/home/j_sizzle/Documents/Lab11-2/hello1.o', needed by '/home/j_sizzle/Documents/Lab11-2/hello1.mod'. Stop. make[1]: *** [Makefile:1825: /home/j_sizzle/Documents/Lab11-2] Error 2 make[1]: Leaving directory '/home/j_sizzle/Documents/buildroot/buildroot-2021.11.1-rpi/output/build/linux-custom' make: *** [Makefile:7: default] Error 2

My Makefile looks like this:

obj-m += hello1.o

KDIR := /home/j_sizzle/Documents/buildroot/buildroot-2021.11.1-rpi/output/build/linux-custom/

PWD := $(shell pwd)

default:

$(MAKE) -C  $(KDIR)  KBUILD_EXTMOD=$(PWD) ARCH=arm CROSS_COMPILE=/home/j_sizzle/Documents/buildroot/buildroot-2021.11.1-rpi/output/host/bin/arm-buildroot-linux-uclibcgnueabihf- modules

clean:

$(MAKE) -C $(KDIR) KBUILD_EXTMOD=$(PWD) clean
rm -f *~cd

I'm not really sure what I need to do here and I am somewhat new to makefiles so sorry if I am doing something dumb. I do know that this cross compiler works when just compiling a c program, but this is my first time trying to use it for modules.