diff --git a/network/open-iscsi/include_sysmacros.patch b/network/open-iscsi/include_sysmacros.patch
new file mode 100644
index 0000000000..75a7231321
--- /dev/null
+++ b/network/open-iscsi/include_sysmacros.patch
@@ -0,0 +1,33 @@
+diff -Naur open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/bnx2.c open-iscsi-2.0.875/iscsiuio/src/unix/libs/bnx2.c
+--- open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/bnx2.c	2017-09-01 20:05:23.000000000 +0200
++++ open-iscsi-2.0.875/iscsiuio/src/unix/libs/bnx2.c	2019-09-06 14:24:47.943039000 +0200
+@@ -47,6 +47,7 @@
+ #include <sys/user.h>
+ #include <fcntl.h>
+ #include <unistd.h>
++#include <sys/sysmacros.h>
+ 
+ #include "config.h"
+ 
+diff -Naur open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/bnx2x.c open-iscsi-2.0.875/iscsiuio/src/unix/libs/bnx2x.c
+--- open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/bnx2x.c	2017-09-01 20:05:23.000000000 +0200
++++ open-iscsi-2.0.875/iscsiuio/src/unix/libs/bnx2x.c	2019-09-06 14:24:23.527039000 +0200
+@@ -51,6 +51,7 @@
+ #include <sys/user.h>
+ #include <fcntl.h>
+ #include <unistd.h>
++#include <sys/sysmacros.h>
+ 
+ #include "config.h"
+ 
+diff -Naur open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/qedi.c open-iscsi-2.0.875/iscsiuio/src/unix/libs/qedi.c
+--- open-iscsi-2.0.875.orig/iscsiuio/src/unix/libs/qedi.c	2017-09-01 20:05:23.000000000 +0200
++++ open-iscsi-2.0.875/iscsiuio/src/unix/libs/qedi.c	2019-09-06 14:29:00.780039000 +0200
+@@ -58,6 +58,7 @@
+ #include <sys/user.h>
+ #include <fcntl.h>
+ #include <unistd.h>
++#include <sys/sysmacros.h>
+ 
+ #include "config.h"
+ 
diff --git a/network/open-iscsi/open-iscsi.SlackBuild b/network/open-iscsi/open-iscsi.SlackBuild
index 00883e1321..54dda75cd6 100644
--- a/network/open-iscsi/open-iscsi.SlackBuild
+++ b/network/open-iscsi/open-iscsi.SlackBuild
@@ -22,9 +22,13 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#
+# 2019/09/08 - add patch to support building on Slackware "current"
+#
+
 PRGNAM=open-iscsi
 VERSION=${VERSION:-2.0.875}
-BUILD=${BUILD:-2}
+BUILD=${BUILD:-3}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -62,6 +66,10 @@ cd $TMP
 rm -rf $PRGNAM-$VERSION
 tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
 cd $PRGNAM-$VERSION
+
+# Allow this SB to work on "current", benign on 14.2.
+patch -p1 <$CWD/include_sysmacros.patch
+
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \