In file options.h

this

#ifdef WITH_PAM_SUPPORT
  int             authenticate_in;
#endif /* WITH_PAM_SUPPORT */
  int             authenticate_timeout;

should read

#ifdef WITH_PAM_SUPPORT
  int             authenticate_in;
  int             authenticate_timeout;
#endif /* WITH_PAM_SUPPORT */

otherwise you get compile errors if no there is no PAM support in the system, as the authenticate_timeout element is used througout the code anyway.

(sorry no diff in the system I was working on :) )