diff -rup a/ckcmai.c b/ckcmai.c
--- a/ckcmai.c	2011-08-20 17:20:42.000000000 -0400
+++ b/ckcmai.c	2023-02-16 15:19:50.728291202 -0500
@@ -1581,6 +1581,10 @@ _PROTOTYP( int getiobs, (VOID) );
 
 #include <signal.h>
 
+#ifndef VMS
+#include <time.h>
+#endif
+
 #ifndef NOCCTRAP
 #include <setjmp.h>
 #include "ckcsig.h"
diff -rup a/ckupty.c b/ckupty.c
--- a/ckupty.c	2011-06-13 11:34:13.000000000 -0400
+++ b/ckupty.c	2023-02-16 16:40:33.519202100 -0500
@@ -384,6 +384,10 @@ struct termbuf {
 
 #endif /* TCSANOW */
 
+#ifdef HAVE_OPENPTY
+#include <pty.h>
+#endif
+
 struct termios termbuf, termbuf2;       /* pty control structure */
 
 #ifdef INIT_SPTY
diff -rup a/ckutio.c b/ckutio.c
--- a/ckutio.c	2011-08-20 17:22:35.000000000 -0400
+++ b/ckutio.c	2023-02-16 16:04:42.656846326 -0500
@@ -14129,6 +14129,10 @@ extern int exp_handler, exp_stderr, exp_
 #endif /* USE_CKUPTY_C */
 #endif /* HAVE_OPENPTY */
 
+#ifdef HAVE_OPENPTY
+#include <pty.h>
+#endif
+
 VOID
 pty_make_raw(fd) int fd; {
     int x = -23, i;
diff -rup a/ckuusx.c b/ckuusx.c
--- a/ckuusx.c	2023-02-16 15:02:46.440896650 -0500
+++ b/ckuusx.c	2023-02-16 15:43:24.925119195 -0500
@@ -5883,6 +5883,9 @@ _PROTOTYP(char *tgetstr,(char *, char **
 _PROTOTYP(int tputs,(char *, int, int (*)()));
 _PROTOTYP(char *tgoto,(const char *, int, int));
 #endif	/* BUG999 */
+#ifdef linux
+#include <term.h>
+#endif
 
 #endif /* CK_CURSES */