Collecting pprocess==0.4
  1 location(s) to search for versions of pprocess:
  * https://pypi.python.org/simple/pprocess/
  Getting page https://pypi.python.org/simple/pprocess/
  Analyzing links from page https://pypi.python.org/simple/pprocess/
    Found link https://pypi.python.org/packages/15/31/e9bdd7e917a19e76d4c81cfaab61740ed6ba6cfb92129a590fdb4332cf6e/pprocess-0.5.1.tar.gz#md5=88cb93ac61968ddb3dbe2a287499fa93 (from https://pypi.python.org/simple/pprocess/), version: 0.5.1
    Found link https://pypi.python.org/packages/2b/16/90e6bd67282f7c87ffaeb0d13e3921edcd4459c7f614faf55b6c5d859871/pprocess-0.3.tar.gz#md5=1bc3f9387822007cad73eef5be12837d (from https://pypi.python.org/simple/pprocess/), version: 0.3
    Found link https://pypi.python.org/packages/41/3c/2cb3c02c9c1907f86a801b3a4185f7a019baf304df0c0d57bfcd55063cd5/pprocess-0.4.tar.gz#md5=b5dcf871772dd71394a7d3b3074fe088 (from https://pypi.python.org/simple/pprocess/), version: 0.4
    Found link https://pypi.python.org/packages/a4/fc/97ae065185ea7f2378869c783857a67c0c9982f5bc2a0fdd03153cf76866/pprocess-0.3.1.tar.gz#md5=1ac660393fc8df672cf971032e732dfa (from https://pypi.python.org/simple/pprocess/), version: 0.3.1
    Found link https://pypi.python.org/packages/d3/66/c1df39dff60daa4cc5ea4a45376ee491d227c425277a663dfacb898745d7/pprocess-0.5.tar.gz#md5=7e1695bf15c419c893c3b526070f4d6a (from https://pypi.python.org/simple/pprocess/), version: 0.5
  Using version 0.4 (newest of versions: 0.4)
  Downloading pprocess-0.4.tar.gz (56kB)
  Downloading from URL https://pypi.python.org/packages/41/3c/2cb3c02c9c1907f86a801b3a4185f7a019baf304df0c0d57bfcd55063cd5/pprocess-0.4.tar.gz#md5=b5dcf871772dd71394a7d3b3074fe088 (from https://pypi.python.org/simple/pprocess/)
  Running setup.py (path:/tmp/pip-build-fq9d4w8c/pprocess/setup.py) egg_info for package pprocess
    Running command python setup.py egg_info
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-fq9d4w8c/pprocess/setup.py", line 5, in <module>
        import pprocess
      File "/tmp/pip-build-fq9d4w8c/pprocess/pprocess.py", line 109
        raise AcknowledgementError, obj
                                  ^
    SyntaxError: invalid syntax
Cleaning up...
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-fq9d4w8c/pprocess/
Exception information:
Traceback (most recent call last):
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/commands/wheel.py", line 199, in run
    if not wb.build():
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/wheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/req/req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/req/req_set.py", line 634, in _prepare_file
    abstract_dist.prep_for_dist()
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/req/req_set.py", line 129, in prep_for_dist
    self.req_to_install.run_egg_info()
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/req/req_install.py", line 439, in run_egg_info
    command_desc='python setup.py egg_info')
  File "/home/piwheels/.local/lib/python3.5/site-packages/pip/utils/__init__.py", line 707, 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-fq9d4w8c/pprocess/