Install the listed requirements

def install_requirements(self, requires):
        """ Install the listed requirements
        """
        # Temporarily install dependencies required by setup.py before trying to import them.
        sys.path[0:0] = ['setup-requires']
        pkg_resources.working_set.add_entry('setup-requires')

        to_install = list(self.missing_requirements(requires))
        if to_install:
            cmd = [sys.executable, "-m", "pip", "install",
                "-t", "setup-requires"] + to_install
            subprocess.call(cmd)