If you run into errors when runningpython setup.py develop, here are some debugging steps:

1. Runprintf '#include <stdio.h>\nint main() { printf("Hello World");}'|clang -x c -; ./a.out to make sureyour CMake works and can compile this simple Hello World program without errors.
2. Nuke yourbuild directory. Thesetup.py script compiles binaries into thebuild folder and caches manydetails along the way, which saves time the next time you build. If you're running into issues, you can alwaysrm -rf build from the toplevelpytorch directory and start over.
3. If you have made edits to the PyTorch repo, commit any change you'd like to keep and clean the repo with thefollowing commands (note that cleanreally removes all untracked files and changes.):

   git submodule deinit -f.git clean -xdfpython setup.py cleangit submodule update --init --recursive# very important to sync the submodulespython setup.py develop# then try running the command again

4. The main step withinpython setup.py develop is runningmake from thebuild directory. If you want toexperiment with some environment variables, you can pass them into the command:

   ENV_KEY1=ENV_VAL1[, ENV_KEY2=ENV_VAL2]* python setup.py develop

If you run into issue runninggit submodule update --init --recursive. Please try the following:

• If you encounter an error such as

  error: Submodule 'third_party/pybind11' could not be updated

  check whether your Git local or global config file contains anysubmodule.* settings. If yes, remove them and try again.(please referencethis doc for more info).

• If you encounter an error such as

  fatal: unable to access 'https://github.com/pybind11/pybind11.git': could not load PEM client certificate ...

  this is likely that you are using HTTP proxying and the certificate expired. To check if the certificate is valid, rungit config --global --list and search for config likehttp.proxysslcert=<cert_file>. Then check certificate valid date by running

  openssl x509 -noout -in<cert_file> -dates

• If you encounter an error that some third_party modules are not checked out correctly, such as

  Could not find .../pytorch/third_party/pybind11/CMakeLists.txt

  remove anysubmodule.* settings in your local git config (.git/config of your pytorch repo) and try again.

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