Fix #914525.

debian/changelog

@@ -1,3 +1,11 @@
+mosquitto (1.5.4-2) unstable; urgency=medium
+
+  * debian/patches/914525.patch : Use pkg-config to get systemd libs
+    (Closes: #914525)
+    - This is needed to allow compilation on non-Linux systems.
+
+ -- Roger A. Light <roger@atchoo.org>  Sun, 25 Nov 2018 13:52:16 +0000
+
 mosquitto (1.5.4-1) unstable; urgency=medium
 
   * New upstream release (Closes: #911104).

debian/patches/914525.patch

@@ -0,0 +1,18 @@
+Description: Use pkg-config to get systemd libs to allow build on non-linux systems
+Author: Roger Light <roger@atchoo.org>
+Forwarded: yes
+--- a/config.mk
++++ b/config.mk
+@@ -235,8 +235,10 @@
+ endif
+ 
+ ifeq ($(WITH_SYSTEMD),yes)
+-	BROKER_CFLAGS:=$(BROKER_CFLAGS) -DWITH_SYSTEMD
+-	BROKER_LIBS:=$(BROKER_LIBS) -lsystemd
++	ifneq ($(shell pkg-config --libs libsystemd),)
++		BROKER_CFLAGS:=$(BROKER_CFLAGS) -DWITH_SYSTEMD $(pkg-config --cflags libsystemd)
++		BROKER_LIBS:=$(BROKER_LIBS) $(pkg-config --libs libsystemd)
++	endif
+ endif
+ 
+ ifeq ($(WITH_SRV),yes)

debian/patches/series

@@ -1 +1,2 @@
+914525.patch
 debian-config.patch