I installed Spack v0.16, and I tried to install callpath. I get the error message below.

I discussed the issue with @becker33, and he says it looks like there is a bug in the dyninst package and the elf providers, so it fails if there is a dependance on dyninst and elf. It looks like the error is releated to elfutils.

The error does not show up in Spack v0.15.

Steps to reproduce the issue

Install Spack, and checkout v0.16

$ spack install callpath

Error Message

Error: '<' not supported between instances of 'str' and 'NoneType'

Information on your system

I run on CentOS 7.

Additional information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output