Hello Nick P,
I never use the Dev ever the one that worked for me was https://github.com/motioneye-project/motioneyeos/releases/tag/20200606 and i did it on a the RPi4 - 4 gb model B and it worked fine. I am not sure what your setup is but i ended up installing it on a VM with Ubuntu Server 20.04.6 and it was awesome make sure you have a big storage drive for it I ended up making a NAS and sharing it with the OS and if you need help we can schedule some time I would happy to walk you through it or you can use my article I wrote on it.
Let me know,
Michael
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nick@raspberrypi:~ $ sudo apt-get install libssl-dev libcurl4-openssl-dev libjpeg-dev zlib1g-dev -y
nick@raspberrypi:~ $ sudo wget https://github.com/Motion-Project/motion/releases/download/release-4.5.1/bullseye_motion_4.5.1-1_arm64.deb
nick@raspberrypi:~ $ sudo dpkg -i bullseye_motion_4.5.1-1_arm64.deb
nick@raspberrypi:~ $ systemctl stop motion
nick@raspberrypi:~ $ systemctl disable motion
nick@raspberrypi:~ $ sudo apt-get install python2 python-dev-is-python2 -y
nick@raspberrypi:~ $ sudo curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
nick@raspberrypi:~ $ python2 get-pip.py
nick@raspberrypi:~ $ sudo apt-get install libssl-dev libcurl4-openssl-dev libjpeg-dev zlib1g-dev -y
All of which seemed to work fine.
Then I tried.
nick@raspberrypi:~ $ pip2 install motioneye
and it all went wrong.

So I gave up, thinking that life is too short.
Nick P
P.s
nick@raspberrypi:~ $ pip install motioneye also failed with "command not found"...