In http://ftp.openbsd.org/pub/OpenBSD/patches/5.7/common/010_tcp-timer.patch.sig
signify -Vep /etc/signify/openbsd-57-base.pub -x 010_tcp_persist.patch.sig \ -m - | (cd /usr/src && patch -p0) should be signify -Vep /etc/signify/openbsd-57-base.pub -x 010_tcp-timer.patch.sig \ -m - | (cd /usr/src && patch -p0) (or the file name is wrong) Cheers.