diff --git a/mail/opensmtpd/Makefile b/mail/opensmtpd/Makefile
index 87662796d..133ca983a 100644
--- a/mail/opensmtpd/Makefile
+++ b/mail/opensmtpd/Makefile
@@ -56,6 +56,11 @@ SUBST_MESSAGE.exampledir=	Fixing exampledir path
 SUBST_FILES.exampledir=		mk/smtpd/Makefile.am
 SUBST_SED.exampledir+=		-e 's,@EXAMPLE_DIR@,${EXAMPLEDIR},'
 
+.include "../../mk/bsd.prefs.mk"
+.if ${OPSYS} == "NetBSD" && ${OS_VARIANT} == "Minix"
+CPPFLAGS+= -D_OPENBSD_SOURCE
+.endif # ${OPSYS} == "NetBSD" && ${OS_VARIANT} == "Minix"
+
 post-extract:
 	cp ${FILESDIR}/mailer.conf ${WRKDIR}/mailer.conf
 
diff --git a/mail/opensmtpd/distinfo b/mail/opensmtpd/distinfo
index 8951e3ab0..20c483658 100644
--- a/mail/opensmtpd/distinfo
+++ b/mail/opensmtpd/distinfo
@@ -9,3 +9,5 @@ SHA1 (patch-mk_makemap_Makefile.am) = 51da0f13b1b32b3c364ae638a38d4b33efaf1ec7
 SHA1 (patch-mk_smtpd_Makefile.am) = ebc62819300d3ddd824178c08a5630ca85dc6fdc
 SHA1 (patch-smtpd_queue__fs.c) = f13d1bf1d26544b3c81e5e2c813d2fe5e917b96b
 SHA1 (patch-smtpd_smtp__session.c) = f9c034827519a02b97cadb3c034ad1e84abc805a
+SHA1 (patch-zz-minix-a) = 3c402b4c78c9d44728cabf2ce9193276b56f2989
+SHA1 (patch-zz-minix-b) = 189bc86f2d6cf93cb6946b6925bab9a65c8b8ac2
diff --git a/mail/opensmtpd/patches/patch-zz-minix-a b/mail/opensmtpd/patches/patch-zz-minix-a
new file mode 100644
index 000000000..e509f7066
--- /dev/null
+++ b/mail/opensmtpd/patches/patch-zz-minix-a
@@ -0,0 +1,11 @@
+--- configure.ac.orig	Sun Mar 13 17:02:45 2016
++++ configure.ac	Sun Mar 13 17:08:12 2016
+@@ -411,7 +411,7 @@
+ 		;;
+ 	esac
+ 	;;
+-*-*-netbsd*)
++	*-*-netbsd*|*-*-minix*)
+ 	check_for_libcrypt_before=1
+ 	if test "x$withval" != "xno" ; then
+ 		need_dash_r=1
diff --git a/mail/opensmtpd/patches/patch-zz-minix-b b/mail/opensmtpd/patches/patch-zz-minix-b
new file mode 100644
index 000000000..a8005e66d
--- /dev/null
+++ b/mail/opensmtpd/patches/patch-zz-minix-b
@@ -0,0 +1,11 @@
+--- smtpd/queue_fs.c.orig	Thu Nov  3 01:23:02 2016
++++ smtpd/queue_fs.c	Thu Nov  3 01:23:52 2016
+@@ -32,7 +32,7 @@
+ #endif
+ #ifdef HAVE_SYS_STATVFS_H
+ #include <sys/statvfs.h>
+-#ifdef __NetBSD__
++#if defined(__minix) || defined(__NetBSD__)
+ #define statfs statvfs
+ #endif
+ #endif