diff --git a/lib/libmilter/Makefile b/lib/libmilter/Makefile
index 17bb09857fcf..b3243c2a66cf 100644
--- a/lib/libmilter/Makefile
+++ b/lib/libmilter/Makefile
@@ -1,37 +1,42 @@
 # $FreeBSD$
 
 .include <src.opts.mk>
 
 PACKAGE=sendmail
 SENDMAIL_DIR=${SRCTOP}/contrib/sendmail
 .PATH:	${SENDMAIL_DIR}/libmilter ${SENDMAIL_DIR}/libsm
 
 CFLAGS+=-I${SENDMAIL_DIR}/src -I${SENDMAIL_DIR}/include -I.
 CFLAGS+=-DNOT_SENDMAIL -Dsm_snprintf=snprintf
 CFLAGS+=-D_THREAD_SAFE
 CFLAGS+=-DSM_CONF_POLL
 
 .if ${MK_INET6_SUPPORT} != "no"
 CFLAGS+=-DNETINET6
 .endif
 
+.if ${MK_OPENSSL} != "no"
+# STARTTLS support
+CFLAGS+=-DSTARTTLS
+.endif
+
 # User customizations to the sendmail build environment
 CFLAGS+=${SENDMAIL_CFLAGS}
 
 INCSDIR=${INCLUDEDIR}/libmilter
 INCS=	${SENDMAIL_DIR}/include/libmilter/mfapi.h \
 	${SENDMAIL_DIR}/include/libmilter/mfdef.h
 LIB=	milter
 
 SRCS+=	sm_os.h
 SRCS+=	main.c engine.c listener.c handler.c comm.c monitor.c smfi.c \
 	signal.c sm_gethost.c errstring.c strl.c worker.c
 CLEANFILES+=sm_os.h
 
 WARNS?=	0
 SHLIB_MAJOR= 6
 
 sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.lib.mk>
diff --git a/lib/libsmutil/Makefile b/lib/libsmutil/Makefile
index ff3f8491225b..7bbd21e21bbb 100644
--- a/lib/libsmutil/Makefile
+++ b/lib/libsmutil/Makefile
@@ -1,26 +1,33 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 PACKAGE=lib${LIB}
 SENDMAIL_DIR=${SRCTOP}/contrib/sendmail
 .PATH:	${SENDMAIL_DIR}/libsmutil
 
 CFLAGS+=-I${SENDMAIL_DIR}/src -I${SENDMAIL_DIR}/include -I.
 CFLAGS+=-DNEWDB -DNIS -DMAP_REGEX -DNOT_SENDMAIL
 
+.if ${MK_OPENSSL} != "no"
+# STARTTLS support
+CFLAGS+=-DSTARTTLS
+.endif
+
 # User customizations to the sendmail build environment
 CFLAGS+=${SENDMAIL_CFLAGS}
 
 WARNS?=	2
 
 LIB=	smutil
 
 SRCS+=	sm_os.h
 SRCS+=	debug.c err.c lockfile.c safefile.c snprintf.c cf.c
 CLEANFILES+=sm_os.h
 
 INTERNALLIB=
 
 sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.lib.mk>