Include appropriate header files to bring function prototypes into scope.

bin/sh/cd.c

@@ -53,6 +53,7 @@ static char sccsid[] = "@(#)cd.c	8.1 (Berkeley) 5/31/93";
 #include "mystring.h"
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <errno.h>
 
 

bin/sh/error.c

@@ -53,6 +53,7 @@ static char sccsid[] = "@(#)error.c	8.1 (Berkeley) 5/31/93";
 #else
 #include <varargs.h>	
 #endif
+#include <unistd.h>
 #include <errno.h>
 
 

bin/sh/eval.c

@@ -62,6 +62,7 @@ static char sccsid[] = "@(#)eval.c	8.1 (Berkeley) 5/31/93";
 #include "mystring.h"
 #include "myhistedit.h"
 #include <signal.h>
+#include <unistd.h>
 
 
 /* flags in argument to evaltree */

bin/sh/exec.c

@@ -67,6 +67,7 @@ static char sccsid[] = "@(#)exec.c	8.1 (Berkeley) 5/31/93";
 #include "jobs.h"
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 

bin/sh/expand.c

@@ -63,6 +63,7 @@ static char sccsid[] = "@(#)expand.c	8.2 (Berkeley) 10/22/93";
 #include <sys/stat.h>
 #include <errno.h>
 #include <dirent.h>
+#include <unistd.h>
 #include <pwd.h>
 
 /*

bin/sh/histedit.c

@@ -44,6 +44,8 @@ static char sccsid[] = "@(#)histedit.c	8.1 (Berkeley) 5/31/93";
 #include <sys/param.h>
 #include <paths.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 #include "shell.h"
 #include "parser.h"
 #include "var.h"

bin/sh/input.c

@@ -43,9 +43,10 @@ static char sccsid[] = "@(#)input.c	8.1 (Berkeley) 5/31/93";
  */
 
 #include <stdio.h>	/* defines BUFSIZ */
-#include "shell.h"
 #include <fcntl.h>
 #include <errno.h>
+#include <unistd.h>
+#include "shell.h"
 #include "syntax.h"
 #include "input.h"
 #include "output.h"

bin/sh/main.c

@@ -47,6 +47,7 @@ static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 5/31/93";
 #include <stdio.h>
 #include <signal.h>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <fcntl.h>
 #include "shell.h"
 #include "main.h"

bin/sh/memalloc.c

@@ -44,6 +44,7 @@ static char sccsid[] = "@(#)memalloc.c	8.1 (Berkeley) 5/31/93";
 #include "error.h"
 #include "machdep.h"
 #include "mystring.h"
+#include <unistd.h>
 
 /*
  * Like malloc, but returns an error when out of space.

bin/sh/miscbltin.c

@@ -44,6 +44,8 @@ static char sccsid[] = "@(#)miscbltin.c	8.2 (Berkeley) 4/16/94";
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <unistd.h>
+#include <ctype.h>
 #include "shell.h"
 #include "options.h"
 #include "var.h"

bin/sh/mystring.c

@@ -48,6 +48,7 @@ static char sccsid[] = "@(#)mystring.c	8.1 (Berkeley) 5/31/93";
  *	is_number(s)		Return true if s is a string of digits.
  */
 
+#include <stdlib.h>
 #include "shell.h"
 #include "syntax.h"
 #include "error.h"

bin/sh/options.c

@@ -52,6 +52,7 @@ static char sccsid[] = "@(#)options.c	8.1 (Berkeley) 5/31/93";
 #include "memalloc.h"
 #include "error.h"
 #include "mystring.h"
+#include <unistd.h>
 
 char *arg0;			/* value of $0 */
 struct shparam shellparam;	/* current positional parameters */

bin/sh/output.c

@@ -61,6 +61,7 @@ static char sccsid[] = "@(#)output.c	8.1 (Berkeley) 5/31/93";
 #include <varargs.h>
 #endif
 #include <errno.h>
+#include <unistd.h>
 
 
 #define OUTBUFSIZ BUFSIZ

bin/sh/trap.c

@@ -52,6 +52,7 @@ static char sccsid[] = "@(#)trap.c	8.1 (Berkeley) 5/31/93";
 #include "trap.h"
 #include "mystring.h"
 #include <signal.h>
+#include <unistd.h>
 
 
 /*

bin/sh/var.c

@@ -55,6 +55,7 @@ static char sccsid[] = "@(#)var.c	8.1 (Berkeley) 5/31/93";
 #include "memalloc.h"
 #include "error.h"
 #include "mystring.h"
+#include <unistd.h>
 
 
 #define VTABSIZE 39