man/daemon.xml: use AM_DISTCHECK_CONFIGURE_FLAGS

Change the man page to recommend setting AM_DISTCHECK_CONFIGURE_FLAGS
instead of DISTCHECK_CONFIGURE_FLAGS. This is the recommended way from
the automake manual, as otherwise the flag can't be overridden by the
user with something like:
  DISTCHECK_CONFIGURE_FLAGS=--some-additional-flags make distcheck

References:
https://www.gnu.org/software/automake/manual/html_node/Checking-the-Distribution.html
https://osmocom.org/issues/3718

diff --git a/man/daemon.xml b/man/daemon.xml
index 36c7c09db18e58bbd82d30a2a26cbb6dc5903a12..7724bb4e08d8efa25008bd9d0cd051b010c9f339 100644 (file)
--- a/man/daemon.xml
+++ b/man/daemon.xml
@@ -593,7 +593,7 @@ AM_CONDITIONAL([HAVE_SYSTEMD], [test "x$with_systemdsystemunitdir" != "xno"])</p
       <citerefentry project='die-net'><refentrytitle>automake</refentrytitle><manvolnum>1</manvolnum></citerefentry>-based
       projects:</para>
 
-      <programlisting>DISTCHECK_CONFIGURE_FLAGS = \
+      <programlisting>AM_DISTCHECK_CONFIGURE_FLAGS = \
   --with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)</programlisting>
 
       <para>Finally, unit files should be installed in the system with an automake excerpt like the following:</para>