diff -urN exim.orig/Makefile exim/Makefile
--- exim.orig/Makefile	2019-02-13 00:31:37.461637000 +0100
+++ exim/Makefile	2019-02-13 02:03:18.369043000 +0100
@@ -3,7 +3,7 @@
 
 PORTNAME=	exim
 PORTVERSION?=	${EXIM_VERSION}
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	mail ipv6
 MASTER_SITES=	EXIM:exim
 MASTER_SITE_SUBDIR=	/exim4/:exim \
@@ -565,6 +565,8 @@
 	@${REINPLACE_CMD} -E -e 's/^(PERL_COMMAND=).*/\1${PERL:S,/,\/,g}/' \
 		-e 's/^(CC=).*/\1${CC:S,/,\/,g}/' ${WRKSRC}/OS/Makefile-Default
 .if ${PORT_OPTIONS:MSA_EXIM}
+	@${REINPLACE_CMD} -E -e 's/^\# (HAVE_LOCAL_SCAN=).*/\1yes/' \
+		${WRKSRC}/OS/Makefile-Default
 	@${REINPLACE_CMD} -E -e 's/^(LOCAL_SCAN_SOURCE=).*/\1Local\/sa-exim.c/' \
 		${WRKSRC}/OS/Makefile-Default
 	@${CP} ${WRKDIR}/sa-exim-${SA_EXIM_VERSION}/sa-exim.c ${WRKSRC}/Local
diff -urN exim.orig/files/patch-OS__Makefile-Default exim/files/patch-OS__Makefile-Default
--- exim.orig/files/patch-OS__Makefile-Default	1970-01-01 01:00:00.000000000 +0100
+++ exim/files/patch-OS__Makefile-Default	2019-02-13 00:38:44.811119000 +0100
@@ -0,0 +1,10 @@
+--- OS/Makefile-Default.orig	2019-01-30 14:59:52.000000000 +0100
++++ OS/Makefile-Default	2019-02-13 00:34:40.753182000 +0100
+@@ -242,6 +242,7 @@
+ # The default setting points to a template function that doesn't actually do
+ # any scanning, but just accepts the message.
+ 
++# HAVE_LOCAL_SCAN=no
+ LOCAL_SCAN_SOURCE=src/local_scan.c
+ 
+ # If you want to specify options for your local_scan() that can be set from