I'd like to have USE_LINUX_TPROXY ("enable full transparent proxy") and not only USE_TPROXY ("enable transparent proxy") support in haproxy.
Created attachment 211905 [details] haproxy-1.3.22-r1.ebuild with full tproxy support
Fixed in haproxy-1.3.22-r1. There was no need for a new USE flag, I've enabled this switch in the same way as in USE_LINUX_SPLICE case.