This is the patch from the old xwit package from Dima Barsky <dima@debian.org>.

The relevant changelog entries are: 
Added -focus option (Thanks to Michael Mauch <michael.mauch@gmx.de> for the patch)
Added -fetch and -store options to access cutbuffers (Closes: #38379)
Some code clean-up to get rid of compilation warnings

diff -u xwit-3.4.orig/xwit.c xwit-3.4/xwit.c
--- xwit-3.4.orig/xwit.c	1997-10-21 03:32:54.000000000 +0200
+++ xwit-3.4/xwit.c	2005-10-21 12:38:48.000000000 +0200
@@ -31,10 +31,14 @@
 #include <X11/Xutil.h>
 #include <X11/Xproto.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/time.h>
 #include "dsimple.h"
 
+Window XmuClientWindow();
+
 /* note: called by dsimple.c code, must be global */
+void
 usage()
 {
 	static char Revision[] = "$Revision: 3.4 $";
@@ -58,7 +62,7 @@
 
 	fprintf(stderr,
 	"usage: %s -display <display> -sync\n\
-	-pop -iconify -unmap\n\
+	-pop -focus -iconify -unmap\n\
 	-resize w h -rows r -columns c -[r]move x y\n\
 	-[r]warp x y -colormap <colormapid> -[no]save\n\
 	-name <name> -iconname <name>\n\
@@ -72,7 +76,7 @@
 }
 
 enum functions {
-    pop, icon, unmap, colormap,
+    pop, focus, icon, unmap, colormap,
     move, rmove, warp, rwarp,
     resize, save, nosave,
     keyrepeat, nokeyrepeat,
@@ -114,6 +118,7 @@
 static int Giconx, Gicony;
 static int nrows;
 static int ncolumns;
+static int nbuffer;
 static char *bitmapname;
 static char *maskname;
 static int Gbs, Gsu;
@@ -127,20 +132,20 @@
 /*
  * sleep for given millisecs for those without usleep
  */
-static
+static void
 mssleep(ms)
 int ms;
 {
     struct timeval tv;
     tv.tv_sec = ms/1000;
     tv.tv_usec = (ms%1000)*1000;
-    select(0,(int*)0,(int*)0,(int*)0,&tv);
+    select(0,NULL,NULL,NULL,&tv);
 }
 
 /*
  * find all windows below this and if name matches call doit on it
  */
-static
+static void
 downtree(top)
 Window top;
 {
@@ -164,7 +169,7 @@
 /*
  * [un]set autorepeat for individual keys
  */
-static
+static void
 setrepeat()
 {
     unsigned long value_mask;
@@ -186,7 +191,7 @@
  * get window position, compensating for decorations
  * (based on xwininfo.c)
  */
-static
+static void
 getpos(window, xp, yp)
 	Window window;
 	int *xp, *yp;
@@ -209,7 +214,7 @@
 /*
  * get window size
  */
-static
+static void
 getsize(window, wp, hp)
 	Window window;
 	int *wp, *hp;
@@ -226,7 +231,7 @@
 /*
  * set window position
  */
-static
+static void
 domove(window, x, y, right, bottom)
 	Window window;
 	int x, y;
@@ -299,7 +304,7 @@
 /*
  * set window size
  */
-static
+static void
 doresize(window, w, h)
     Window window;
     int w, h;
@@ -343,7 +348,7 @@
 /*
  * set row/column size
  */
-static
+static void
 rcresize(what, window)
     enum functions what;
     Window window;
@@ -375,7 +380,7 @@
     XFree(hints);
 }
 
-static
+static void
 loadbitmap(window, file, pmp)
 	Window window;
 	char *file;
@@ -389,7 +394,7 @@
 		Fatal_Error("XReadBitmapFile failed");
 }
 
-static
+static void
 setbitmap(window)
 	Window window;
 {
@@ -418,7 +423,7 @@
 		XSetCloseDownMode(dpy, RetainTemporary);
 	}
 
-	if (ohints = XGetWMHints(dpy, window)) {
+	if ((ohints = XGetWMHints(dpy, window)) != NULL ) {
 		if (ohints->icon_pixmap && hints->icon_pixmap)
 			XFreePixmap(dpy, ohints->icon_pixmap);
 		if (ohints->icon_mask && hints->icon_mask)
@@ -429,7 +434,7 @@
 	XSetWMHints(dpy, window, hints);
 }
 
-static
+static void
 setwinattr(window)
 	Window window;
 {
@@ -501,6 +506,9 @@
 		case pop:
 			XMapRaised(dpy, window);
 			break;
+		case focus:
+		        XSetInputFocus(dpy, window, CurrentTime, RevertToNone);
+			break;
 		case unmap:
 			XUnmapWindow(dpy, window);
 			break;
@@ -633,6 +641,7 @@
 		return id;
 	Fatal_Error("Invalid ID format: %s", s);
 	/* NOTREACHED */
+        return -1;
 }
 
 static int
@@ -709,6 +718,43 @@
 	return match;
 }
 
+void
+FetchBuffer( dpy, nbuf )
+	Display *dpy;
+	int nbuf;
+{
+        char *buf;
+        int size;
+
+        buf = XFetchBuffer(dpy, &size, nbuf);
+
+        if( size == 0 )
+                fprintf( stderr, "Could not fetch cutbuffer %d\n", nbuf );
+        else
+                fwrite( buf, 1, size, stdout );
+}
+
+void
+StoreBuffer( dpy, nbuf )
+	Display *dpy;
+	int nbuf;
+{
+        char *buf = NULL;
+        int bufsize, nread, total=0;
+
+        bufsize = 10;
+        buf = malloc( bufsize );
+        while( (nread=read(0,buf+total,bufsize-total)) > 0 )
+        {
+                total+=nread;
+                bufsize *= 2;
+                buf = realloc( buf, bufsize );
+        }
+        XStoreBuffer(dpy, buf, total, nbuf);
+        free(buf);
+}
+
+int
 main(argc, argv)
 	int argc;
 	char **argv;
@@ -745,6 +791,14 @@
 			function |= FBIT(columns);
 			ncolumns = atoi(*++argv);
 		}
+		else if (matchopt("store*buffer", 1, pargc, argv)) {
+			nbuffer = atoi(*++argv);
+                        StoreBuffer( dpy, nbuffer );
+		}
+		else if (matchopt("fetch*buffer", 1, pargc, argv)) {
+			nbuffer = atoi(*++argv);
+                        FetchBuffer( dpy, nbuffer );
+		}
 		else if (matchopt("c*urrent", 0, pargc, argv)) {
 			Winidmode = WID_curr;
 		}
@@ -845,6 +899,9 @@
 		else if (matchopt("p*op", 0, pargc, argv)) {
 			function |= FBIT(pop);
 		}
+		else if (matchopt("f*ocus", 0, pargc, argv)) {
+			function |= FBIT(focus);
+		}
 		else if (matchopt("ri*conmove", 2, pargc, argv)) {
 			function |= FBIT(riconmove);
 			Giconx = atoi(argv[1]);
@@ -938,6 +995,8 @@
 	case WID_select:
 		window = xwit_select_window(dpy, 0);
 		break;
+	default:
+	        break;
 	}
 
 	switch (Winidmode) {
@@ -956,5 +1015,6 @@
 
 	XSync(dpy, True);
 	(void) XCloseDisplay(dpy);
-	exit(!Gwinfound);
+	return(!Gwinfound);
 }
+
diff -u xwit-3.4.orig/xwit.man xwit-3.4/xwit.man
--- xwit-3.4.orig/xwit.man	1997-11-12 08:32:56.000000000 +0100
+++ xwit-3.4/xwit.man	2005-10-21 12:38:48.000000000 +0200
@@ -10,6 +10,7 @@
 .IR display ]
 .RB [ -sync ]
 .RB [ -pop ]
+.RB [ -focus ]
 .RB [ -iconify ]
 .RB [ -unmap ]
 .br
@@ -77,6 +78,9 @@
 is the default action.
 It need only be given if it is wanted as well as some other function.
 .TP
+-focus
+will give the input focus to the specified window.
+.TP
 -iconify
 will iconify the windows instead of popping them.
 .TP