diff -BburN WindowMaker-0.80.1.orig/configure WindowMaker-0.80.1/configure
--- WindowMaker-0.80.1.orig/configure	Tue Jul  2 02:37:46 2002
+++ WindowMaker-0.80.1/configure	Thu Sep  5 10:01:24 2002
@@ -11747,7 +11747,7 @@
 fi
 
 
-xinerama=no
+xinerama=yes
 #AC_ARG_ENABLE(xinerama,
 #[  --disable-xinerama	  disable XInerama extension support],
 #		xinerama=$enableval, xinerama=yes)
diff -BburN WindowMaker-0.80.1.orig/configure.ac WindowMaker-0.80.1/configure.ac
--- WindowMaker-0.80.1.orig/configure.ac	Tue Mar 26 11:47:11 2002
+++ WindowMaker-0.80.1/configure.ac	Thu Sep  5 10:01:12 2002
@@ -461,10 +461,10 @@
 
 dnl XINERAMA support
 dnl ================
-xinerama=no
-#AC_ARG_ENABLE(xinerama, 
-#[  --disable-xinerama	  disable XInerama extension support],
-#		xinerama=$enableval, xinerama=yes)
+xinerama=yes
+AC_ARG_ENABLE(xinerama, 
+[  --disable-xinerama	  disable XInerama extension support],
+		xinerama=$enableval, xinerama=yes)
 
 if test "$xinerama" = yes; then
 	AC_CHECK_LIB(Xinerama, XineramaQueryScreens, [XLIBS="-lXinerama $XLIBS"
diff -BburN WindowMaker-0.80.1.orig/src/dialog.c WindowMaker-0.80.1/src/dialog.c
--- WindowMaker-0.80.1.orig/src/dialog.c	Thu Feb 21 12:28:48 2002
+++ WindowMaker-0.80.1/src/dialog.c	Thu Sep  5 10:00:06 2002
@@ -145,6 +145,7 @@
     Window parent;
     WWindow *wwin;
     int result;
+    WMPoint center;
 
     panel = WMCreateAlertPanel(scr->wmscreen, NULL, title, message,
                                defBtn, altBtn, othBtn);
@@ -163,9 +164,9 @@
 
     XReparentWindow(dpy, WMWidgetXID(panel->win), parent, 0, 0);
 
-    wwin = wManageInternalWindow(scr, parent, None, NULL,
-                                (scr->scr_width - 400)/2,
-                                (scr->scr_height - 180)/2, 400, 180);
+    center = getCenter(scr, 400, 180);
+    wwin = wManageInternalWindow(scr, parent, None, NULL, center.x, center.y,
+                                400, 180);
     wwin->client_leader = WMWidgetXID(panel->win);
 
     WMMapWidget(panel->win);
diff -BburN WindowMaker-0.80.1.orig/src/placement.c WindowMaker-0.80.1/src/placement.c
--- WindowMaker-0.80.1.orig/src/placement.c	Tue Jan  8 14:45:13 2002
+++ WindowMaker-0.80.1/src/placement.c	Thu Sep  5 10:00:05 2002
@@ -39,7 +39,7 @@
 #include "application.h"
 #include "appicon.h"
 #include "dock.h"
-
+#include "xinerama.h"
 
 extern WPreferences wPreferences;
 
@@ -334,6 +334,28 @@
     return sum_isect;
 }
 
+#ifdef XINERAMA
+static int
+isOverBoard(WScreen *scr, int x, int y, unsigned int w, unsigned int h)
+{
+  WMRect rect;
+  WMPoint point;
+
+  point.x = x;
+  point.y = y;
+
+  rect = wGetRectForHead(scr, wGetHeadForPoint(scr, point));
+  if (rect.pos.x <= x &&
+      rect.pos.y <= y && 
+      x + w <= rect.pos.x + rect.size.width -
+      				wPreferences.window_place_origin.x &&
+      y + h <= rect.pos.y + rect.size.height - 
+      				wPreferences.window_place_origin.y)
+    return 0;
+  else
+    return 1;
+}
+#endif
 
 static void
 smartPlaceWindow(WWindow *wwin, int *x_ret, int *y_ret,
@@ -367,6 +388,11 @@
 
 	while ((test_x + width) < usableArea.x2) {
 
+#ifdef XINERAMA
+	    if (isOverBoard(scr, test_x, test_y, width, height)) {
+              sum_isect = INT_MAX;
+	    } else
+#endif
             sum_isect = calcSumOfCoveredAreas(wwin, test_x, test_y,
                                               width, height);
 
@@ -395,6 +421,11 @@
 
     for (test_x = from_x; test_x < to_x; test_x++) {
         for (test_y = from_y; test_y < to_y; test_y++) {
+#ifdef XINERAMA
+	    if (isOverBoard(scr, test_x, test_y, width, height)) {
+              sum_isect = INT_MAX;
+	    } else
+#endif
             sum_isect = calcSumOfCoveredAreas(wwin, test_x, test_y,
                                               width, height);
 
diff -BburN WindowMaker-0.80.1.orig/src/xinerama.c WindowMaker-0.80.1/src/xinerama.c
--- WindowMaker-0.80.1.orig/src/xinerama.c	Sat Feb 16 05:53:33 2002
+++ WindowMaker-0.80.1/src/xinerama.c	Thu Sep  5 10:00:04 2002
@@ -220,6 +220,8 @@
 
 WMRect wGetUsableRectForHead(WScreen *scr, int head)
 {
+    WMRect rect;
+
     if (head < scr->xine_count) {
 	rect.pos.x = scr->xine_screens[head].x_org;
 	rect.pos.y = scr->xine_screens[head].y_org;