dnl A macro to check presence of systemd on the system
PKG_CHECK_EXISTS([systemd],
                 [HAVE_SYSTEMD=yes],
                 [HAVE_SYSTEMD=no])

dnl Libraries libsystemd-journal and libsystem-login are deprecarted
dnl since systemd 209 and are removed in systemd 230. The library libsystemd
dnl is replacement of libsystemd-{login,journal,daemon,id128} libraries
PKG_CHECK_EXISTS([libsystemd],
                 [HAVE_LIBSYSTEMD=yes],
                 [HAVE_LIBSYSTEMD=no])

AS_IF([test x$HAVE_LIBSYSTEMD = xyes],
      [login_lib_name=libsystemd],
      [login_lib_name=libsystemd-login])

AS_IF([test x$HAVE_SYSTEMD = xyes],
      [AC_DEFINE_UNQUOTED([HAVE_SYSTEMD], 1, [Build with systemd support])],
      [AC_MSG_NOTICE([Build without systemd support])])

AS_IF([test x$HAVE_SYSTEMD = xyes],
      [PKG_CHECK_MODULES(
          [SYSTEMD_LOGIN],
          [$login_lib_name],
          [AC_DEFINE_UNQUOTED([HAVE_SYSTEMD_LOGIN], 1,
                              [Build with $login_lib_name support])],
          [AC_MSG_NOTICE([Build without $login_lib_name support])])],
      [AC_MSG_NOTICE([Build without $login_lib_name support])])

AS_IF([test x$HAVE_LIBSYSTEMD = xyes],
      [daemon_lib_name=libsystemd],
      [daemon_lib_name=libsystemd-daemon])

AS_IF([test x$HAVE_SYSTEMD = xyes],
      [PKG_CHECK_MODULES(
          [SYSTEMD_DAEMON],
          [$daemon_lib_name],
          [AC_DEFINE_UNQUOTED([HAVE_SYSTEMD_DAEMON], 1,
                              [Build with $daemon_lib_name support])],
          [AC_MSG_NOTICE([Build without $daemon_lib_name support])])],
      [AC_MSG_NOTICE([Build without $daemon_lib_name support])])

dnl A macro to check presence of journald on the system
AC_DEFUN([AM_CHECK_JOURNALD],
[
    AS_IF([test x$HAVE_LIBSYSTEMD = xyes],
          [journal_lib_name=libsystemd],
          [journal_lib_name=libsystemd-journal])

    PKG_CHECK_MODULES(JOURNALD, [$journal_lib_name],
                      [AC_DEFINE_UNQUOTED([WITH_JOURNALD], 1,
                                          [journald is available])])
    dnl Some older versions of pkg-config might not set these automatically
    dnl while setting CFLAGS and LIBS manually twice doesn't hurt.
    AC_SUBST([JOURNALD_CFLAGS])
    AC_SUBST([JOURNALD_LIBS])
])