How-to Install PIP on Linux
The linked Linux Tutorials Shows You Step-by-Step the Linux Install PIP.
Especially relevant: Python Setuptools & PIP Packages are Now Automatically Installed on All Systems by the get-pip.py Script.
Futhermore Python Pip is the Recommended Tool for Installing New Python Packages from the PyPI Repositories.
Finally Pip builds packages by invoking the build system. Presently, the only supported build system is setuptools, but future developments to the Python packaging infrastructure are expected to include support for other build systems. As well as package building, the build system is also invoked to install packages direct from source.