Hello Doug,
Updated the patch to not do the #undef pgbench11-ppoll-v11.patch attached.
Patch applies. Do not forget to regenerate configure to test... I've compiled and run with both ppoll & select options without issues. Two quite minor style comment (at least 2 instances): if (cond) return false; else return true; ISTM that the simpler the better: return !cond;Also ISTM that the following does not comply with pg C style expectations (idem, 2 instances):
} else { -- Fabien.