Index: Mk/Features/sanitize.mk
===================================================================
--- /dev/null
+++ Mk/Features/sanitize.mk
@@ -0,0 +1,24 @@
+# Sanitize Support
+#
+# In order to enable it, add to your to your make.conf:
+# - For all ports (not advised): WITH_SANITIZE=yes
+# - For a specified port:  WITH_SANITIZE_PORTS+=ftp/curl
+# In order to replace the default asan by others, like msan as example:
+# SANITIZE_FLAGS="memory"
+#
+
+.if !defined(_SANITIZE_MK_INCLUDED)
+_SANITIZE_MK_INCLUDED=	yes
+SANITIZE_Include_MAINTAINER=	portmgr@FreeBSD.org
+
+.  if !defined(SANITIZE_UNSAFE)
+     SANITIZE_FLAGS?=	address
+.    if defined(_INCLUDE_USES_MESON_MK)
+       MESON_ARGS+= -Db_sanitize=${SANITIZE_FLAGS}
+.    else
+       CFLAGS+=		-fsanitize=${SANITIZE_FLAGS}
+       CXXFLAGS+=	-fsanitize=${SANITIZE_FLAGS}
+       LDFLAGS+=	-fsanitize=${SANITIZE_FLAGS}
+.    endif
+.  endif
+.endif
Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -1016,7 +1016,7 @@
 # These need to be absolute since we don't know how deep in the ports
 # tree we are and thus can't go relative.  They can, of course, be overridden
 # by individual Makefiles or local system make configuration.
-_LIST_OF_WITH_FEATURES=	debug lto ssp pie relro bind_now
+_LIST_OF_WITH_FEATURES=	bind_now debug lto pie relro sanitize ssp
 _DEFAULT_WITH_FEATURES=	ssp
 PORTSDIR?=		/usr/ports
 LOCALBASE?=		/usr/local