1 diff --git a/acinclude.m4 b/acinclude.m4
 
   2 index 580eb4a..bd7e2c9 100644
 
   5 @@ -594,6 +594,30 @@ AC_DEFUN(APACHE_CHECK_OPENSSL,[
 
   9 +AC_DEFUN(APACHE_CHECK_SYSTEMD, [                                                                        
 
  10 +dnl Check for systemd support for listen.c's socket activation.
 
  13 +   if test -n "$PKGCONFIG" && $PKGCONFIG --exists libsystemd; then
 
  14 +      SYSTEMD_LIBS=`$PKGCONFIG --libs libsystemd`
 
  15 +   elif test -n "$PKGCONFIG" && $PKGCONFIG --exists libsystemd-daemon; then
 
  16 +      SYSTEMD_LIBS=`$PKGCONFIG --libs libsystemd-daemon`
 
  18 +      AC_CHECK_LIB(systemd-daemon, sd_notify, SYSTEMD_LIBS="-lsystemd-daemon")
 
  20 +   if test -n "$SYSTEMD_LIBS"; then
 
  21 +      AC_CHECK_HEADERS(systemd/sd-daemon.h)
 
  22 +      if test "${ac_cv_header_systemd_sd_daemon_h}" = "no" || test -z "${SYSTEMD_LIBS}"; then
 
  23 +        AC_MSG_WARN([Your system does not support systemd.])
 
  25 +        APR_ADDTO(LIBS, [$SYSTEMD_LIBS])
 
  26 +        AC_DEFINE(HAVE_SYSTEMD, 1, [Define if systemd is supported])
 
  34  dnl APACHE_EXPORT_ARGUMENTS
 
  35  dnl Export (via APACHE_SUBST) the various path-related variables that
 
  36 diff --git a/configure.in b/configure.in
 
  37 index 19a5f88..f096de3 100644
 
  40 @@ -509,6 +509,8 @@ if test "$ac_cv_struct_tm_gmtoff" = "yes"; then
 
  41      AC_DEFINE(HAVE_GMTOFF, 1, [Define if struct tm has a tm_gmtoff field])
 
  46  dnl ## Set up any appropriate OS-specific environment variables for apachectl