Collecting pysolver==0.0.1
  1 location(s) to search for versions of pysolver:
  * https://pypi.python.org/simple/pysolver/
  Getting page https://pypi.python.org/simple/pysolver/
  Analyzing links from page https://pypi.python.org/simple/pysolver/
    Found link https://pypi.python.org/packages/cd/67/f32118816795801fd4eb386596082df9fdafc47bcc58b9d8dcf58ef66189/pysolver-0.0.1.tar.gz#md5=abb4149e72e4b6170a16433b4b63bdb3 (from https://pypi.python.org/simple/pysolver/), version: 0.0.1
    Found link https://pypi.python.org/packages/eb/51/e2cbc4b7ef84c212e614c0bdf350dd259093b85b7cab62236e3cfab2ba29/pysolver-0.0.3.tar.gz#md5=fe53057f44e578015e4b8e1aa28a0694 (from https://pypi.python.org/simple/pysolver/), version: 0.0.3
    Found link https://pypi.python.org/packages/f1/5e/28df64847c4c2b5db88632c974b75f13b0abcf6d2af8626c3cfe52046c8b/pysolver-0.0.2.tar.gz#md5=561617445c0669824aa8caface71e719 (from https://pypi.python.org/simple/pysolver/), version: 0.0.2
  Using version 0.0.1 (newest of versions: 0.0.1)
  Downloading pysolver-0.0.1.tar.gz
  Downloading from URL https://pypi.python.org/packages/cd/67/f32118816795801fd4eb386596082df9fdafc47bcc58b9d8dcf58ef66189/pysolver-0.0.1.tar.gz#md5=abb4149e72e4b6170a16433b4b63bdb3 (from https://pypi.python.org/simple/pysolver/)
  Running setup.py (path:/tmp/pip-build-u72b2p4p/pysolver/setup.py) egg_info for package pysolver
    Running command python setup.py egg_info
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-u72b2p4p/pysolver/setup.py", line 17, in <module>
        install_requires=parse_requirements('requirements.txt'),
      File "/tmp/pip-build-u72b2p4p/pysolver/setup.py", line 5, in parse_requirements
        [line.strip() for line in open(filename).readlines()]))
    FileNotFoundError: [Errno 2] No such file or directory: 'requirements.txt'
Cleaning up...
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-u72b2p4p/pysolver/
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/wheel.py", line 199, in run
    if not wb.build():
  File "/usr/lib/python3/dist-packages/pip/wheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 634, in _prepare_file
    abstract_dist.prep_for_dist()
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 129, in prep_for_dist
    self.req_to_install.run_egg_info()
  File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 439, in run_egg_info
    command_desc='python setup.py egg_info')
  File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 725, in call_subprocess
    % (command_desc, proc.returncode, cwd))
pip.exceptions.InstallationError: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-u72b2p4p/pysolver/