diff --git a/libmilter/PKGBUILD b/libmilter/PKGBUILD
new file mode 100644
index 000000000..16328730f
--- /dev/null
+++ b/libmilter/PKGBUILD
@@ -0,0 +1,52 @@
+# $Id$
+# Maintainer: Gaetan Bisson <bisson@archlinux.org>
+# Contributor: Sergej Pupykin <pupykin.s+arch@gmail.com>
+# Contributor: mutantmonkey <mutantmonkey@gmail.com>
+
+pkgname=libmilter
+_pkgname=sendmail
+pkgver=8.15.2
+pkgrel=1
+pkgdesc='Implementation of the sendmail Mail Filter API'
+url='https://www.proofpoint.com/us/sendmail-open-source'
+arch=('x86_64')
+options=('staticlibs')
+license=('custom:Sendmail open source license')
+validpgpkeys=('30BCA74705FA415455731D7BAAF5B5DE05BDCC53')
+source=("http://ftp.sendmail.org/${_pkgname}.${pkgver}.tar.gz"{,.sig}
+        'fd-passing-libmilter.patch')
+sha256sums=('24f94b5fd76705f15897a78932a5f2439a32b1a2fdc35769bb1a5f5d9b4db439'
+            'SKIP'
+            'b856ebc17e39151652bda93f40f79756ac83eb4a0b67e6d55c049f3ebde42983')
+
+prepare() {
+	cd "${srcdir}/${_pkgname}-${pkgver}"
+	patch -p1 -i ../fd-passing-libmilter.patch # FS#49421
+
+	# From http://www.j-chkmail.org/wiki/doku.php/doc/installation/start#libmilter
+	cat >> devtools/Site/site.config.m4 <<EOF
+dnl Include our flags
+APPENDDEF(\`conf_libmilter_ENVDEF',\`${CPPFLAGS} ${CFLAGS}')
+dnl Enable libmilter with a pool of workers
+APPENDDEF(\`conf_libmilter_ENVDEF',\`-D_FFR_WORKERS_POOL=1 -DMIN_WORKERS=4')
+dnl Use poll instead of select
+APPENDDEF(\`conf_libmilter_ENVDEF',\`-DSM_CONF_POLL=1')
+dnl Enable IPv6
+APPENDDEF(\`conf_libmilter_ENVDEF',\`-DNETINET6=1')
+dnl Add -fPIC
+APPENDDEF(\`conf_libmilter_ENVDEF',\`-fPIC')
+EOF
+}
+
+build() {
+	cd "${srcdir}/${_pkgname}-${pkgver}/${pkgname}"
+	./Build
+}
+
+package() {
+	cd "${srcdir}/${_pkgname}-${pkgver}/${pkgname}"
+	install -d "${pkgdir}/usr/lib"
+	./Build DESTDIR="${pkgdir}" install
+	install -Dm644 ../LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
+	chown -R root:root "${pkgdir}"
+}
diff --git a/libmilter/fd-passing-libmilter.patch b/libmilter/fd-passing-libmilter.patch
new file mode 100644
index 000000000..3ab61a6fa
--- /dev/null
+++ b/libmilter/fd-passing-libmilter.patch
@@ -0,0 +1,80 @@
+Description: systemd-like socket activation support for libmilter
+Author: Mikhail Gusarov <dottedmag@debian.org
+diff --git a/libmilter/docs/smfi_setconn.html b/libmilter/docs/smfi_setconn.html
+index 70a510e..013f04e 100644
+--- a/libmilter/docs/smfi_setconn.html
++++ b/libmilter/docs/smfi_setconn.html
+@@ -43,6 +43,7 @@ Set the socket through which this filter should communicate with sendmail.
+ 	<LI><CODE>{unix|local}:/path/to/file</CODE> -- A named pipe.
+ 	<LI><CODE>inet:port@{hostname|ip-address}</CODE> -- An IPV4 socket.
+ 	<LI><CODE>inet6:port@{hostname|ip-address}</CODE> -- An IPV6 socket.
++	<LI><CODE>fd:number</CODE> -- Pre-opened file descriptor.
+ 	</UL>
+ 	</TD></TR>
+     </TABLE>
+diff --git a/libmilter/listener.c b/libmilter/listener.c
+index 48c552f..2249a1f 100644
+--- a/libmilter/listener.c
++++ b/libmilter/listener.c
+@@ -197,6 +197,11 @@ mi_milteropen(conn, backlog, rmsocket, name)
+ 			L_socksize = sizeof addr.sin6;
+ 		}
+ #endif /* NETINET6 */
++		else if (strcasecmp(p, "fd") == 0)
++		{
++			addr.sa.sa_family = AF_UNSPEC;
++			L_socksize = sizeof (_SOCK_ADDR);
++		}
+ 		else
+ 		{
+ 			smi_log(SMI_LOG_ERR, "%s: unknown socket type %s",
+@@ -443,7 +448,21 @@ mi_milteropen(conn, backlog, rmsocket, name)
+ 	}
+ #endif /* NETINET || NETINET6 */
+ 
+-	sock = socket(addr.sa.sa_family, SOCK_STREAM, 0);
++	if (addr.sa.sa_family == AF_UNSPEC)
++	{
++		char *end;
++		sock = strtol(colon, &end, 10);
++		if (*end != '\0' || sock < 0)
++		{
++			smi_log(SMI_LOG_ERR, "%s: expected positive integer as fd, got %s", name, colon);
++			return INVALID_SOCKET;
++		}
++	}
++	else
++	{
++		sock = socket(addr.sa.sa_family, SOCK_STREAM, 0);
++	}
++
+ 	if (!ValidSocket(sock))
+ 	{
+ 		smi_log(SMI_LOG_ERR,
+@@ -466,6 +485,7 @@ mi_milteropen(conn, backlog, rmsocket, name)
+ #if NETUNIX
+ 	    addr.sa.sa_family != AF_UNIX &&
+ #endif /* NETUNIX */
++	    addr.sa.sa_family != AF_UNSPEC &&
+ 	    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &sockopt,
+ 		       sizeof(sockopt)) == -1)
+ 	{
+@@ -511,7 +531,8 @@ mi_milteropen(conn, backlog, rmsocket, name)
+ 	}
+ #endif /* NETUNIX */
+ 
+-	if (bind(sock, &addr.sa, L_socksize) < 0)
++	if (addr.sa.sa_family != AF_UNSPEC &&
++	    bind(sock, &addr.sa, L_socksize) < 0)
+ 	{
+ 		smi_log(SMI_LOG_ERR,
+ 			"%s: Unable to bind to port %s: %s",
+@@ -817,7 +838,7 @@ mi_listener(conn, dbg, smfi, timeout, backlog)
+ # ifdef BSD4_4_SOCKADDR
+ 		     cliaddr.sa.sa_len == 0 ||
+ # endif /* BSD4_4_SOCKADDR */
+-		     cliaddr.sa.sa_family != L_family))
++		     (L_family != AF_UNSPEC && cliaddr.sa.sa_family != L_family)))
+ 		{
+ 			(void) closesocket(connfd);
+ 			connfd = INVALID_SOCKET;