Disable openpty() and forkpty() prototypes when needed.
--- a/yasr/yasr.h
+++ b/yasr/yasr.h
@@ -308,8 +308,10 @@ extern void opt_set(int num, void *val);
 extern void opt_queue_empty(int ll);
 extern void opt_write(FILE * fp);
 
+#ifndef HAVE_OPENPTY
 /* openpty.c prototypes */
 extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
+#endif
 
 /* cfmakeraw.c prototypes */
 extern void cfmakeraw(struct termios *);
@@ -317,8 +319,10 @@ extern void cfmakeraw(struct termios *);
 /* login_tty.c prototypes */
 extern int login_tty(int);
 
+#ifndef HAVE_FORKPTY
 /* forkpty.c prototypes */
 extern int forkpty(int *, char *, struct termios *, struct winsize *);
+#endif
 
 /* tbc - Would it be more efficient to ensure that "blank" grids always held
    ascii 0x20 rather than ascii 0x00? */