check_users: Use utmpx(5) only if available

For systems that don't provide an utmpx(5) interface, restore the code
that was replaced in commit 3e622f3a47bc7d31f22513a79892c3c52febd2d3.

1 files changed, 4 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index de75e53..529720e 100644
--- a/configure.in
+++ b/configure.in
@@ -316,6 +316,10 @@ AS_IF([test "x$with_ldap" != "xno"], [
   LIBS="$_SAVEDLIBS"
 ])
 
+dnl Check for headers used by check_users
+AC_CHECK_HEADERS(utmpx.h)
+AM_CONDITIONAL([HAVE_UTMPX], [test "$ac_cv_header_utmpx_h" = "yes"])
+
 dnl Check for headers used by check_ide_smart
 case $host in
   *linux*)