Error with makefile.common for microecc

I am following various tutorials on how to run an example DFU

I've tried: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v17.1.0%2Flib_bootloader_modules.html

and:  Getting started with Nordic's Secure DFU bootloader, a step by step guide  

I am being blocked by building microecc

I have installed make and am using: nRF5_SDK_15.3.0_59ac345

I've also modified Makefile.posix and Makefile.windows to point to where I have make installed

However there seems to be an error in the Makefile.common file which I have not modified.

It throws this error:

'C:\Users\CALEB' is not recognized as an internal or external command,
operable program or batch file.
make: *** [../../../../components/toolchain/gcc/Makefile.common:254: _build] Error 1

This is blocking our product development. Please help as soon as possible.

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