xdm-1.1.12 and libsystemd-daemon deprecated after systemd 209

[Ross Alexander]

Hello,
I'm not entirely sure which version of systemd removed libsystemd-daemon completely but it looks like it was a while ago now (around end of 2014 I think).
libsystemd is API compatible so linking against libsystemd works fine.  I've made a very hacky patch in autoconf to detect it but it may be cleaner to just test against libsystemd instead.
Regards,Ross
PS: I can resend this to a mailing list is that is appropriate.



mojo 12:17:27 xdm-1.1.12$ diff -c configure.ac.orig configure.ac
*** configure.ac.orig   2019-03-14 11:53:38.157485274 +0000
--- configure.ac        2019-03-14 12:08:13.510417541 +0000
***************
*** 173,186 ****
        [Add support for systemd startup notification (default is autodetected)]),
        [USE_SYSTEMD_DAEMON=$withval], [USE_SYSTEMD_DAEMON=auto])
  AS_IF([test "x$USE_SYSTEMD_DAEMON" != "xno"], [
!     PKG_CHECK_MODULES([SYSTEMD_DAEMON], [libsystemd-daemon],
        [AC_DEFINE(USE_SYSTEMD_DAEMON,1,[Use systemd startup notification])],
        [AS_IF([test "x$USE_SYSTEMD_DAEMON" = "xyes"],
!           [AC_MSG_ERROR([systemd startup notification support requested, but libsystemd-daemon not found.])]
        )]
      )
- ])
  AM_CONDITIONAL(USE_SYSTEMD_DAEMON, [test "x$USE_SYSTEMD_DAEMON" != "xno"])

  # FIXME: Find better test for which OS'es use su -m  - for now, just try to
  # mirror the Imakefile setting of:
--- 173,191 ----
        [Add support for systemd startup notification (default is autodetected)]),
        [USE_SYSTEMD_DAEMON=$withval], [USE_SYSTEMD_DAEMON=auto])
  AS_IF([test "x$USE_SYSTEMD_DAEMON" != "xno"], [
!     PKG_CHECK_MODULES([SYSTEMD_DAEMON], [libsystemd >= 209],
        [AC_DEFINE(USE_SYSTEMD_DAEMON,1,[Use systemd startup notification])],
        [AS_IF([test "x$USE_SYSTEMD_DAEMON" = "xyes"],
!       [PKG_CHECK_MODULES([SYSTEMD_DAEMON], [libsystemd-daemon < 209],
!               [AC_DEFINE(USE_SYSTEMD_DAEMON,1,[Use systemd startup notification])],
!               [AS_IF([test "x$USE_SYSTEMD_DAEMON" = "xyes"],
!               [AC_MSG_ERROR([systemd startup notification support requested, but libsystemd-daemon not found.])]
!               )]
        )]
+     )]
      )
  AM_CONDITIONAL(USE_SYSTEMD_DAEMON, [test "x$USE_SYSTEMD_DAEMON" != "xno"])
+ ])

  # FIXME: Find better test for which OS'es use su -m  - for now, just try to
  # mirror the Imakefile setting of:
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