🐛 Bug

When building from master, the error in the title appears.

To Reproduce

Steps to reproduce the behavior:

1. checkout master
2. build

Expected behavior

Build works

Environment

• PyTorch Version: 1.4 master
• OS (e.g., Linux): Fedora Linux
• How you installed PyTorch (conda, pip, source): source
• Build command you used (if compiling from source): python setup.py develop
• Python version: 3.7.4
• CUDA/cuDNN version: irrelevant
• GPU models and configuration: irrelevant
• Any other relevant information: irrelevant

Additional context

Problem is with nccl, as described here: NVIDIA/nccl#244

The patch described there seems to be working but a workaround would be nice.