I am seeing the same error when attempting to build Docker images for https://github.com/jonemo/pythonnet-docker for all combinations that involve Python 3.6.5:

Python 3.6.5, Mono 4.8.0.524, Python.NET 2.3.0
Python 3.6.5, Mono 4.8.0.524, Python.NET master branch
Python 3.6.5, Mono 5.2.0.224, Python.NET master branch
Python 3.6.5, Mono 5.4.1.6, Python.NET master branch

Python 3.5.5 and 3.4.8 are not affected.

Here is the output I get for the command pip install pythonnet==2.3.0 (almost identical to what's behind the Travis link above):

Step 3/3 : RUN pip install pycparser   && pip install pythonnet==2.3.0
 ---> Running in 306362b2258a
Collecting pycparser
  Downloading pycparser-2.18.tar.gz (245kB)
Building wheels for collected packages: pycparser
  Running setup.py bdist_wheel for pycparser: started
  Running setup.py bdist_wheel for pycparser: finished with status 'done'
  Stored in directory: /root/.cache/pip/wheels/95/14/9a/5e7b9024459d2a6600aaa64e0ba485325aff7a9ac7489db1b6
Successfully built pycparser
Installing collected packages: pycparser
Successfully installed pycparser-2.18
Collecting pythonnet==2.3.0
  Downloading pythonnet-2.3.0.tar.gz (1.5MB)
Building wheels for collected packages: pythonnet
  Running setup.py bdist_wheel for pythonnet: started
  Running setup.py bdist_wheel for pythonnet: finished with status 'error'
  Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-zrnh3win/pythonnet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmp9rlc9nv2pip-wheel- --python-tag cp36:
  running bdist_wheel
  running build
  running build_ext
  Checking for updates from https://www.nuget.org/api/v2/.
  Currently running NuGet.exe 3.5.0.
  Updating NuGet.exe to 4.5.1.
  Update successful.
  MSBuild auto-detection: using msbuild version '14.0' from '/usr/lib/mono/xbuild/14.0/bin'.
  MSBUILD: error MSBUILD0004: Too many project files specified

  WARNING: Error reading msbuild project information, ensure that your input solution or project file is valid. NETCore and UAP projects will be skipped, only packages.config files will be restored.
  Restoring NuGet package NUnit.3.6.0.
  Restoring NuGet package NUnit.ConsoleRunner.3.6.0.
  Restoring NuGet package UnmanagedExports.1.2.7.
    GET https://api.nuget.org/v3-flatcontainer/nunit.consolerunner/3.6.0/nunit.consolerunner.3.6.0.nupkg
    GET https://api.nuget.org/v3-flatcontainer/nunit/3.6.0/nunit.3.6.0.nupkg
    GET https://api.nuget.org/v3-flatcontainer/unmanagedexports/1.2.7/unmanagedexports.1.2.7.nupkg
    OK https://api.nuget.org/v3-flatcontainer/nunit/3.6.0/nunit.3.6.0.nupkg 266ms
  Installing NUnit 3.6.0.
    OK https://api.nuget.org/v3-flatcontainer/unmanagedexports/1.2.7/unmanagedexports.1.2.7.nupkg 910ms
  Installing UnmanagedExports 1.2.7.
    OK https://api.nuget.org/v3-flatcontainer/nunit.consolerunner/3.6.0/nunit.consolerunner.3.6.0.nupkg 1216ms
  Installing NUnit.ConsoleRunner 3.6.0.
  Adding package 'UnmanagedExports.1.2.7' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'
  Adding package 'NUnit.ConsoleRunner.3.6.0' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'
  Added package 'UnmanagedExports.1.2.7' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'
  Added package 'NUnit.ConsoleRunner.3.6.0' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'
  Adding package 'NUnit.3.6.0' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'
  Added package 'NUnit.3.6.0' to folder '/tmp/pip-build-zrnh3win/pythonnet/packages'

  NuGet Config files used:
      /root/.config/NuGet/NuGet.Config

  Feeds used:
      https://api.nuget.org/v3/index.json

  Installed:
      3 package(s) to packages.config projects
  clang: warning: /usr/local/include/python3.6m: 'linker' input unused
  Traceback (most recent call last):
    File "tools/geninterop/geninterop.py", line 292, in <module>
      sys.exit(main())
    File "tools/geninterop/geninterop.py", line 274, in main
      ast = parser.parse(python_h)
    File "/usr/local/lib/python3.6/site-packages/pycparser/c_parser.py", line 152, in parse
      debug=debuglevel)
    File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 331, in parse
      return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
    File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 1199, in parseopt_notrack
      tok = call_errorfunc(self.errorfunc, errtoken, self)
    File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 193, in call_errorfunc
      r = errorfunc(token)
    File "/usr/local/lib/python3.6/site-packages/pycparser/c_parser.py", line 1761, in p_error
      column=self.clex.find_tok_column(p)))
    File "/usr/local/lib/python3.6/site-packages/pycparser/plyparser.py", line 66, in _parse_error
      raise ParseError("%s: %s" % (coord, msg))
  pycparser.plyparser.ParseError: /usr/include/crypt.h:33:6: before: __THROW
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-build-zrnh3win/pythonnet/setup.py", line 405, in <module>
      zip_safe=False,
    File "/usr/local/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
      return distutils.core.setup(**attrs)
    File "/usr/local/lib/python3.6/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/usr/local/lib/python3.6/distutils/dist.py", line 955, in run_commands
      self.run_command(cmd)
    File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.6/site-packages/wheel/bdist_wheel.py", line 204, in run
      self.run_command('build')
    File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.6/distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
    File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 339, in run
      self.build_extensions()
    File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
      self._build_extensions_serial()
    File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
      self.build_extension(ext)
    File "/tmp/pip-build-zrnh3win/pythonnet/setup.py", line 191, in build_extension
      subprocess.check_call([sys.executable, geninterop, interop_file])
    File "/usr/local/lib/python3.6/subprocess.py", line 291, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['/usr/local/bin/python', 'tools/geninterop/geninterop.py', 'src/runtime/interop36m.cs']' returned non-zero exit status 1.

  ----------------------------------------
  Failed building wheel for pythonnet
  Running setup.py clean for pythonnet
Failed to build pythonnet
Installing collected packages: pythonnet
  Running setup.py install for pythonnet: started
    Running setup.py install for pythonnet: finished with status 'error'
    Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-zrnh3win/pythonnet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-9h9w6f8b-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    Checking for updates from https://www.nuget.org/api/v2/.
    Currently running NuGet.exe 4.5.1.
    NuGet.exe is up to date.
    MSBuild auto-detection: using msbuild version '14.0' from '/usr/lib/mono/xbuild/14.0/bin'.
    MSBUILD: error MSBUILD0004: Too many project files specified

    WARNING: Error reading msbuild project information, ensure that your input solution or project file is valid. NETCore and UAP projects will be skipped, only packages.config files will be restored.
    All packages listed in packages.config are already installed.
    clang: warning: /usr/local/include/python3.6m: 'linker' input unused
    Traceback (most recent call last):
      File "tools/geninterop/geninterop.py", line 292, in <module>
        sys.exit(main())
      File "tools/geninterop/geninterop.py", line 274, in main
        ast = parser.parse(python_h)
      File "/usr/local/lib/python3.6/site-packages/pycparser/c_parser.py", line 152, in parse
        debug=debuglevel)
      File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 331, in parse
        return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
      File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 1199, in parseopt_notrack
        tok = call_errorfunc(self.errorfunc, errtoken, self)
      File "/usr/local/lib/python3.6/site-packages/pycparser/ply/yacc.py", line 193, in call_errorfunc
        r = errorfunc(token)
      File "/usr/local/lib/python3.6/site-packages/pycparser/c_parser.py", line 1761, in p_error
        column=self.clex.find_tok_column(p)))
      File "/usr/local/lib/python3.6/site-packages/pycparser/plyparser.py", line 66, in _parse_error
        raise ParseError("%s: %s" % (coord, msg))
    pycparser.plyparser.ParseError: /usr/include/crypt.h:33:6: before: __THROW
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-zrnh3win/pythonnet/setup.py", line 405, in <module>
        zip_safe=False,
      File "/usr/local/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
        return distutils.core.setup(**attrs)
      File "/usr/local/lib/python3.6/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/local/lib/python3.6/distutils/dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.6/site-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/usr/local/lib/python3.6/distutils/command/install.py", line 545, in run
        self.run_command('build')
      File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.6/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/local/lib/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/local/lib/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 339, in run
        self.build_extensions()
      File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
        self._build_extensions_serial()
      File "/usr/local/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
        self.build_extension(ext)
      File "/tmp/pip-build-zrnh3win/pythonnet/setup.py", line 191, in build_extension
        subprocess.check_call([sys.executable, geninterop, interop_file])
      File "/usr/local/lib/python3.6/subprocess.py", line 291, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['/usr/local/bin/python', 'tools/geninterop/geninterop.py', 'src/runtime/interop36m.cs']' returned non-zero exit status 1.

    ----------------------------------------
Command "/usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-zrnh3win/pythonnet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-9h9w6f8b-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-zrnh3win/pythonnet/
The command '/bin/sh -c pip install pycparser   && pip install pythonnet==2.3.0' returned a non-zero code: 1

python 3.7 issues #609

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