Another 'not a supported wheel file' with pip3 on Arch Linux

Hi,

Getting a not supported wheel file error when running following pip3 install command on Arch Linux:
cuda4: [lsun] % pip3 install http://download.pytorch.org/whl/cu91/torch-0.3.1-cp36-cp36m-linux_x86_64.whl --user
torch-0.3.1-cp36-cp36m-linux_x86_64.whl is not a supported wheel on this platform.

Environment details:

4.14.15-1-ARCH #1 SMP PREEMPT Tue Jan 23 21:49:25 UTC 2018 x86_64 GNU/Linux

cuda4: [lsun] % pip3 --version
pip 9.0.1 from /usr/pkg/lib/python3.6/site-packages (python 3.6)

cuda4: [lsun] % python3.6 --version
Python 3.6.4

cuda4: [lsun] % nvcc --version
nvcc: NVIDIA ® Cuda compiler driver
Copyright © 2005-2017 NVIDIA Corporation
Built on Fri_Nov__3_21:07:56_CDT_2017
Cuda compilation tools, release 9.1, V9.1.85

Any pointers greatly appreciated!