diff -Nru plotnetcfg-0.4.1/debian/changelog plotnetcfg-0.4.1/debian/changelog
--- plotnetcfg-0.4.1/debian/changelog	2018-05-16 23:12:20.000000000 +0000
+++ plotnetcfg-0.4.1/debian/changelog	2019-09-06 20:44:12.000000000 +0000
@@ -1,3 +1,14 @@
+plotnetcfg (0.4.1-4) unstable; urgency=medium
+
+  * Fix the build to allow cross-building. Thanks to Helmut Grohne for the
+    patch! Closes: #939611.
+  * Set “Rules-Requires-Root: no”.
+  * Switch to debhelper compatibility level 12.
+  * Fix a spelling mistake flagged by Lintian.
+  * Standards-Version 4.4.0, no further change required.
+
+ -- Stephen Kitt <skitt@debian.org>  Fri, 06 Sep 2019 22:44:12 +0200
+
 plotnetcfg (0.4.1-3) unstable; urgency=medium
 
   * Migrate to Salsa.
diff -Nru plotnetcfg-0.4.1/debian/compat plotnetcfg-0.4.1/debian/compat
--- plotnetcfg-0.4.1/debian/compat	2018-05-15 13:32:07.000000000 +0000
+++ plotnetcfg-0.4.1/debian/compat	1970-01-01 00:00:00.000000000 +0000
@@ -1 +0,0 @@
-11
diff -Nru plotnetcfg-0.4.1/debian/control plotnetcfg-0.4.1/debian/control
--- plotnetcfg-0.4.1/debian/control	2018-05-16 23:11:51.000000000 +0000
+++ plotnetcfg-0.4.1/debian/control	2019-09-06 20:42:45.000000000 +0000
@@ -2,13 +2,14 @@
 Maintainer: Stephen Kitt <skitt@debian.org>
 Section: net
 Priority: optional
-Build-Depends: debhelper (>= 11~),
+Build-Depends: debhelper-compat (= 12),
                libjansson-dev,
                pkg-config
-Standards-Version: 4.1.4
+Standards-Version: 4.4.0
 Vcs-Browser: https://salsa.debian.org/debian/plotnetcfg
 Vcs-Git: https://salsa.debian.org/debian/plotnetcfg.git
 Homepage: https://github.com/jbenc/plotnetcfg
+Rules-Requires-Root: no
 
 Package: plotnetcfg
 Architecture: linux-any
diff -Nru plotnetcfg-0.4.1/debian/patches/cross.patch plotnetcfg-0.4.1/debian/patches/cross.patch
--- plotnetcfg-0.4.1/debian/patches/cross.patch	1970-01-01 00:00:00.000000000 +0000
+++ plotnetcfg-0.4.1/debian/patches/cross.patch	2019-09-06 20:39:21.000000000 +0000
@@ -0,0 +1,25 @@
+Description: Allow overriding pkg-config and gcc
+Author: Helmut Grohne <helmut@subdivi.de>
+Bug-Debian: https://bugs.debian.org/939611
+
+This allows the package to be cross-built.
+
+--- plotnetcfg-0.4.1.orig/Makefile
++++ plotnetcfg-0.4.1/Makefile
+@@ -1,5 +1,6 @@
++PKG_CONFIG?=pkg-config
+ ifeq ($(jansson),)
+-libs=$(shell pkg-config --libs jansson)
++libs=$(shell $(PKG_CONFIG) --libs jansson)
+ else
+ libs=$(jansson)/src/.libs/libjansson.a
+ INCLUDE=-I$(jansson)/src
+@@ -13,7 +14,7 @@
+ 	    handlers/bridge.o handlers/master.o handlers/openvswitch.o handlers/veth.o \
+ 	    handlers/vlan.o \
+ 	    frontends/dot.o frontends/json.o
+-	gcc $(LDFLAGS) -o $@ $+ $(libs)
++	$(CC) $(LDFLAGS) -o $@ $+ $(libs)
+ 
+ args.o: args.c args.h
+ ethtool.o: ethtool.c ethtool.h
diff -Nru plotnetcfg-0.4.1/debian/patches/series plotnetcfg-0.4.1/debian/patches/series
--- plotnetcfg-0.4.1/debian/patches/series	2015-09-20 17:42:59.000000000 +0000
+++ plotnetcfg-0.4.1/debian/patches/series	2019-09-06 20:41:29.000000000 +0000
@@ -1 +1,3 @@
 use-flags.patch
+cross.patch
+spelling.patch
diff -Nru plotnetcfg-0.4.1/debian/patches/spelling.patch plotnetcfg-0.4.1/debian/patches/spelling.patch
--- plotnetcfg-0.4.1/debian/patches/spelling.patch	1970-01-01 00:00:00.000000000 +0000
+++ plotnetcfg-0.4.1/debian/patches/spelling.patch	2019-09-06 20:42:00.000000000 +0000
@@ -0,0 +1,14 @@
+Description: Spelling fixes
+Author: Stephen Kitt <skitt@debian.org>
+
+--- a/plotnetcfg-json.5
++++ b/plotnetcfg-json.5
+@@ -177,7 +177,7 @@
+ peer
+ .I (object)
+ If present, the peer address corresponding to this address. It's of the
+-address object type but cannot contain futher peer field.
++address object type but cannot contain further peer field.
+ 
+ .SH SEE ALSO
+ .BR plotnetcfg (8)