+m4_include([m4/ax_lib_nettle.m4])
+
+AX_LIB_NETTLE(auto)
+AC_CHECK_HEADER([systemd/sd-daemon.h], [
+ AC_CHECK_LIB([systemd-daemon], [sd_listen_fds],
+ [AC_DEFINE([HAVE_SYSTEMD], [1], [sd_listen_fds is available])
+ AC_SUBST([SYSTEMD_LIBS], [-lsystemd-daemon])
+ ],
+ AC_CHECK_LIB([systemd], [sd_listen_fds],
+ [AC_DEFINE([HAVE_SYSTEMD], [1], [sd_listen_fds is available])
+ AC_SUBST([SYSTEMD_LIBS], [-lsystemd])
+ ])
+ )
+])
+