Index: security/tor/Makefile
===================================================================
--- security/tor/Makefile
+++ security/tor/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	tor
 PORTVERSION=	0.3.1.9
+PORTREVISION=	1
 CATEGORIES=	security net ipv6
 MASTER_SITES=	TOR
 
Index: security/tor/files/patch-orconfig.h.in
===================================================================
--- /dev/null
+++ security/tor/files/patch-orconfig.h.in
@@ -0,0 +1,11 @@
+--- orconfig.h.in.orig	2017-12-15 18:50:05 UTC
++++ orconfig.h.in
+@@ -517,7 +517,7 @@
+ #undef HAVE_TIME_H
+ 
+ /* Define to 1 if you have the `timingsafe_memcmp' function. */
+-#undef HAVE_TIMINGSAFE_MEMCMP
++// #undef HAVE_TIMINGSAFE_MEMCMP // disabled: timingsafe_memcmp(3) has been added only in 12.0, and isn't yet available on older systems
+ 
+ /* Define to 1 if you have the `TLS_method' function. */
+ #undef HAVE_TLS_METHOD