configure: Do not fail when systemd is not installed

Use --with-systemdsystemunitdir instead of --enabled-systemd so it's
possible to enable systemd even if systemd is not installed.

diff --git a/configure.ac b/configure.ac
index 63506ac..1bfff1e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -321,19 +321,15 @@ PKG_CHECK_MODULES(XTABLES, xtables, dummy=yes,
 AC_SUBST(XTABLES_CFLAGS)
 AC_SUBST(XTABLES_LIBS)
 
-
-AC_ARG_ENABLE(systemd, AC_HELP_STRING([--enable-systemd],
-               [enable systemd support]), [enable_systemd=${enableval}])
-if (test "${enable_systemd}" = "yes"); then
-       PKG_CHECK_MODULES(SYSTEMD, systemd, dummy=yes,
-                               AC_MSG_ERROR(systemd is required))
-       SYSTEMD_UNITDIR="`$PKG_CONFIG --variable=systemdsystemunitdir systemd`"
-       if (test -z "${SYSTEMD_UNITDIR}"); then
-               SYSTEMD_UNITDIR="/lib/systemd/system"
-       fi
-       AC_SUBST(SYSTEMD_UNITDIR)
+AC_ARG_WITH([systemdsystemunitdir],
+       AC_HELP_STRING([--with-systemdsystemunitdir=DIR],
+                       [path to systemd service directory]),
+       [], [with_systemdsystemunitdir=
+                       $($PKG_CONFIG --variable=systemdsystemunitdir systemd)])
+if test "x$with_systemdsystemunitdir" != xno; then
+    AC_SUBST(SYSTEMD_UNITDIR, [$with_systemdsystemunitdir])
 fi
-AM_CONDITIONAL(SYSTEMD, test "${enable_systemd}" = "yes")
+AM_CONDITIONAL(SYSTEMD, [test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ])
 
 AC_ARG_ENABLE(polkit,
        AC_HELP_STRING([--enable-polkit], [enable PolicyKit support]),