configure: Document --enable-logind behaviour correctly

The code does not enabled logind unconditionally by default.  Instead
configure checks for logind (libsystemd) availability and enables it
only if found.

Signed-off-by: Evgeny Grin (Karlson2k) <k2k@drgrin.dev>

diff --git a/configure.ac b/configure.ac
index f332c37e45e6aa57e1491cff6ebd63b169d196bc..72f96d2c580a9e52fcc9e90fb5114f2c26b231ba 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -153,7 +153,7 @@ AC_ARG_ENABLE([lastlog],
 
 AC_ARG_ENABLE([logind],
        [AS_HELP_STRING([--enable-logind],
-               [enable logind @<:@default=yes@:>@])],
+               [enable logind @<:@default=yes if found@:>@])],
        [enable_logind="${enableval}"],
        [enable_logind="yes"]
 )