AC_CHECK_LIB(pam, pam_authenticate, , )
dnl Checks for header files.
-AC_CHECK_HEADERS(pty.h endian.h paths.h lastlog.h shadow.h netgroup.h maillock.h utmp.h sys/select.h sys/time.h)
+AC_CHECK_HEADERS(pty.h endian.h paths.h lastlog.h shadow.h netgroup.h maillock.h utmp.h util.h sys/select.h sys/time.h)
dnl Checks for library functions.
AC_CHECK_FUNCS(openpty strlcpy strlcat mkdtemp arc4random setproctitle setlogin setenv)