when i make pip install -r requirement

[jackylee1]

Command "/usr/local/bin/python -u -c "import setuptools, tokenize;file='/tmp/pip-build-r3m4ignc/dlib/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-k1sm7d3d-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-r3m4ignc/dlib/

stops at 73% and show the error

[jackylee1]

subprocess.CalledProcessError: Command '['cmake', '--build', '.', '--config', 'Release', '--', '-j4']' returned non-zero exitstatus 2.

[albertpumarola]

Looks like you are missing a system dependency... Sorry, I do not have any other insight. Maybe someone that had a similar problem will be able to help you.