- Don't require systemd: if it's there, we will use it, if it is

not there like in a base container image, there is nothing to do
  for us.

OBS-URL: https://build.opensuse.org/package/show/Base:System/issue-generator?expand=0&rev=8

issue-generator.changes

@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Tue Nov 28 11:51:23 CET 2017 - kukuk@suse.de
+
+- Don't require systemd: if it's there, we will use it, if it is
+  not there like in a base container image, there is nothing to do
+  for us.
+
 -------------------------------------------------------------------
 Thu Nov 23 13:42:31 UTC 2017 - rbrown@suse.com
 

issue-generator.spec

@@ -16,11 +16,6 @@
 #
 
 
-#Compat macro for new _fillupdir macro introduced in Nov 2017
-%if ! %{defined _fillupdir}
-  %define _fillupdir /var/adm/fillup-templates
-%endif
-
 Name:           issue-generator
 Version:        1.3
 Release:        0
@@ -33,7 +28,6 @@ BuildRequires:  fdupes
 Requires(post): %fillup_prereq
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildArch:      noarch
-%{?systemd_requires}
 
 %description
 issue-generator is a tool to create an issue file dynamically.
@@ -57,7 +51,9 @@ install -m 644 udev/sysconfig.issue-generator %{buildroot}%{_fillupdir}/
 %service_add_pre issue-generator.service issue-add-ssh-keys.service
 
 %post
+if [ -x %{_bindir}/systemd-tmpfiles ]; then
  %{_bindir}/systemd-tmpfiles --create issue-generator.conf ||:
+fi
 %{fillup_only -n issue-generator}
 %service_add_post issue-generator.service issue-add-ssh-keys.service