The current develop is broken, please reset hard to 4.0.0-beta1. It should work.
cd src/frappe
git reset --hard 4.0.0-beta1
cd ../erpnext
git reset --hard 4.0.0-beta1
To investigate the output of the pip command, run it from the src directory. Most likely suspect is lxml if you have low memory or have not installed the dependencies. If it fails to low memory, running it again might fix the problem as pip leaves the build directory intact while exiting and the compiler continues from where it left, I think. (on the $5 digital ocean droplet, it worked when I tried twice).
Thanks,
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Pratik
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>> Pratik
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