--- ./configure.ac.orig	2013-06-08 04:58:54.000000000 +0000
+++ ./configure.ac	2018-04-11 12:36:14.299642065 +0000
@@ -35,6 +35,10 @@ AC_CHECK_LIB([nsl], [gethostbyname])
 AC_CHECK_LIB([m], [log10])
 AC_CHECK_LIB([pthread], [pthread_create])
 
+PKG_PROG_PKG_CONFIG
+
+PKG_CHECK_MODULES([SYSTEMD], [libsystemd])
+
 #
 # Checks for header files
 #
--- ./slpd/Makefile.am.orig	2018-04-11 12:35:51.810698096 +0000
+++ ./slpd/Makefile.am	2018-04-11 12:36:14.300642062 +0000
@@ -95,5 +95,5 @@ noinst_HEADERS = \
 	slpd_initda.h
     
 #if you're building on Irix, replace .la with .a below
-slpd_LDADD = ../common/libcommonslpd.la ../libslpattr/libslpattr.la
+slpd_LDADD = $(SYSTEMD_LIBS) ../common/libcommonslpd.la ../libslpattr/libslpattr.la
 
--- ./slpd/slpd_main.c.orig	2018-04-11 12:35:51.814698086 +0000
+++ ./slpd/slpd_main.c	2018-04-11 12:38:04.513363806 +0000
@@ -59,6 +59,8 @@
 #include "slp_net.h"
 #include "slp_network.h"
 
+#include <systemd/sd-daemon.h>
+
 int G_SIGALRM;
 int G_SIGTERM;
 int G_SIGHUP;
@@ -704,6 +706,9 @@ int main(int argc, char * argv[])
    /* init watcher */
    SLPDDatabaseWatcher();
 
+   /* tell systemd what we are ready */
+   sd_notify(0, "READY=1");
+
    /* drop privileges to reduce security risk */
    if (DropPrivileges())
       SLPDFatal("Could not drop privileges\n");