diff -uap httpd-2.4.27/modules/arch/unix/config5.m4.systemd httpd-2.4.27/modules/arch/unix/config5.m4
--- httpd-2.4.27/modules/arch/unix/config5.m4.systemd
+++ httpd-2.4.27/modules/arch/unix/config5.m4
@@ -18,6 +18,16 @@
   fi
 ])
 
+APACHE_MODULE(systemd, Systemd support, , , all, [
+  if test "${ac_cv_header_systemd_sd_daemon_h}" = "no" || test -z "${SYSTEMD_LIBS}"; then
+    AC_MSG_WARN([Your system does not support systemd.])
+    enable_systemd="no"
+  else
+    APR_ADDTO(MOD_SYSTEMD_LDADD, [$SYSTEMD_LIBS])
+    enable_systemd="yes"
+  fi
+])
+
 APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])
 
 APACHE_MODPATH_FINISH