#   macros for configuring systemd
#   Copyright 2015, Sami Kerola, CloudFlare.
#   BSD licensed.
AC_ARG_ENABLE([systemd],
       [AS_HELP_STRING([--enable-systemd], [compile with systemd support])],
       [], [enable_systemd=no])
have_systemd=no
AS_IF([test "x$enable_systemd" != xno], [
   ifdef([PKG_CHECK_MODULES], [
       dnl systemd v209 or newer
       PKG_CHECK_MODULES([SYSTEMD], [libsystemd], [have_systemd=yes], [have_systemd=no])
       dnl old systemd library
       AS_IF([test "x$have_systemd" != "xyes"], [
               PKG_CHECK_MODULES([SYSTEMD_DAEMON], [libsystemd-daemon],
                       [have_systemd_daemon=yes], [have_systemd_daemon=no])
               AS_IF([test "x$have_systemd_daemon" = "xyes"],
                       [have_systemd=yes])
       ])
       AS_CASE([$enable_systemd:$have_systemd],
       [yes:no],
               [AC_MSG_ERROR([systemd enabled but libsystemd not found])],
       [*:yes],
               [AC_DEFINE([HAVE_SYSTEMD], [1], [Define to 1 if systemd should be used])
               LIBS="$LIBS $SYSTEMD_LIBS"
               ]
       )
   ], [
       AC_MSG_ERROR([systemd enabled but need pkg-config to configure for it, also, run aclocal before autoconf, or run autoreconf to include pkgconfig macros])
   ])
])