Created attachment 210694 [details]
configure script runs uname -m to check architecture. uname -m prints powerpc on powerpc64. Use uname -p instead.
Thank you for the report and patch Piotr. Could you:
- Report the issue or submit a PR upstream 
- Add comment/links to the upstream issue/PR in the patch header
- Confirm QA for this patch on !ppc !ppc64 ARCH's
It looks like this fix is already upstreamed: https://github.com/concurrencykit/ck/commit/999d4612e873bb19867ad1d7043c9c18c7c4d3b9