diff -ur a/exp_win.c b/exp_win.c
--- a/exp_win.c	2018-02-02 14:15:52.000000000 -0500
+++ b/exp_win.c	2023-10-10 07:47:33.082690432 -0400
@@ -39,7 +39,8 @@
 /* Sigh.  On AIX 2.3, termios.h exists but does not define TIOCGWINSZ */
 /* Instead, it has to come from ioctl.h.  However, As I said above, this */
 /* can't be cavalierly included on all machines, even when it exists. */
-#if defined(HAVE_TERMIOS) && !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H)
+/* Darwin also has termios.h, but it requires ioctl.h for `ioctl`. */
+#if defined(HAVE_TERMIOS) && (defined(__APPLE__) || !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H))
 #  include <sys/ioctl.h>
 #endif
 
diff -ur d/pty_termios.c c/pty_termios.c
--- d/pty_termios.c	2023-10-10 07:59:23.244452442 -0400
+++ c/pty_termios.c	2023-10-10 08:00:35.303231582 -0400
@@ -7,7 +7,18 @@
 
 */
 
-#include <pty.h> /* openpty */
+/* openpty */
+#if defined(__APPLE__)
+#  include <util.h>
+#elif defined(__FreeBSD__)
+#  include <sys/types.h>
+#  include <sys/ioctl.h>
+#  include <termios.h>
+#  include <libutil.h>
+#else /* pty.h is Linux-specific */
+#  include <pty.h>
+#endif
+
 #include <stdio.h>
 #include <signal.h>