--- a/configure.ac.old	2017-07-24 18:13:26.503059867 +0200
+++ b/configure.ac	2017-07-24 18:14:21.283523500 +0200
@@ -24,8 +24,12 @@
 dnl AC_CHECK_LIB(nsl, yp_get_default_domain)
 AC_CHECK_LIB(pthread, pthread_create)
 
-PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 209], [USE_SD_NOTIFY=1], [USE_SD_NOTIFY=0])
-AC_SUBST(USE_SD_NOTIFY)
+AC_ARG_ENABLE([systemd], AS_HELP_STRING([--enable-systemd], [Enable systemd notify support (default: disabled)]))
+AS_IF([test "x$enable_systemd" = "xyes"], [
+ PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 209], [USE_SD_NOTIFY=1], [USE_SD_NOTIFY=0])
+ AC_SUBST(USE_SD_NOTIFY)
+])
+
 #PKG_CHECK_MODULES([NSL], [libnsl], [], [AC_CHECK_LIB([nsl],[yp_match],[LIBNSL_LIBS="-lnsl"],[LIBNSL_LIBS=""])])
 PKG_CHECK_MODULES([NSL], [libnsl])
 PKG_CHECK_MODULES([TIRPC], [libtirpc], [], [TIRPC_LIBS=""])