CM-14.1 compilation error on Ubuntu 32 bit

I'm attempting to rebuild Cyanogenmod 14.1 with Realtek drivers support. I have managed to download the entire CM source code as well proprietary specific files for my phone which is a Motorola Nexus 6 (shamu) as mentioned in this guide Android CyanogenMod Kernel Building

However, I'm facing problems with the final step of compiling the ROM. I run the following command:

brunch shamu

(shamu being the codename for my device)

then i get the following output.....

including vendor/cm/vendorsetup.sh

build/core/envsetup.mk:89: *** Unable to determine HOST_ARCH from uname -sm: Linux i686!.  Stop.

Device shamu not found. Attempting to retrieve device repository from CyanogenMod Github (http://github.com/CyanogenMod).

Found repository: android_device_moto_shamu

Default revision: cm-14.1

Checking branch info

Checking if device/moto/shamu is fetched from android_device_moto_shamu

CyanogenMod/android_device_moto_shamu already fetched to device/moto/shamu

Syncing repository to retrieve project.

Fetching project CyanogenMod/android_device_moto_shamu

Fetching projects: 100% (1/1), done.  



Repository synced!

Looking for dependencies in device/moto/shamu

Done

build/core/envsetup.mk:89: *** Unable to determine HOST_ARCH from uname -sm: Linux i686!.  Stop.

build/core/envsetup.mk:89: *** Unable to determine HOST_ARCH from uname -sm: Linux i686!.  Stop.



** Don't have a product spec for: 'cm_shamu'

** Do you have the right repo manifest?



No such item in brunch menu. Try 'breakfast'

what could the following error mean?

build/core/envsetup.mk:89: *** Unable to determine HOST_ARCH from uname -sm: Linux i686!.  Stop

UPDATE (solved)

I had to delete the ~/android/system/out folder and run brunch shamu again.