Index: head/sysutils/liburcu/files/patch-urcu_syscall-compat.h
===================================================================
--- head/sysutils/liburcu/files/patch-urcu_syscall-compat.h	(revision 433655)
+++ head/sysutils/liburcu/files/patch-urcu_syscall-compat.h	(revision 433656)
@@ -1,11 +1,11 @@
 --- urcu/syscall-compat.h.orig	2016-11-30 21:05:22 UTC
 +++ urcu/syscall-compat.h
 @@ -32,7 +32,7 @@
  #elif defined(__linux__) || defined(__GLIBC__)
  #include <syscall.h>
  
 -#elif defined(__CYGWIN__) || defined(__APPLE__)
-+#elif defined(__CYGWIN__) || defined(__APPLE__) || defined(__FreeBSD__)
++#elif defined(__CYGWIN__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__)
  /* Don't include anything on Cygwin or MacOSX. */
  
  #else