import logging
import os
import tempfile
import shutil
import warnings
from pip.req import InstallRequirement, RequirementSet, parse_requirements
from pip.locations import virtualenv_no_global, distutils_scheme
from pip.basecommand import Command
from pip.index import PackageFinder
from pip.exceptions import InstallationError, CommandError, PreviousBuildDirError
from pip import cmdoptions
from pip.utils.deprecation import RemovedInPip7Warning, RemovedInPip8Warning
Pip build option to use multicore