diff -up dwm-4.9/config.def.h dwm-4.9-nokill/config.def.h
--- dwm-4.9/config.def.h	2008-04-03 22:57:01.000000000 +0200
+++ dwm-4.9-nokill/config.def.h	2008-04-11 16:35:49.000000000 +0200
@@ -14,8 +14,9 @@
 const char tags[][MAXTAGLEN] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
 
 Rule rules[] = {
-	/* class	instance	title		tags ref	isfloating */
-	{ "Gimp",	NULL,		NULL,		NULL,		True },
+	/* class	instance	title		tags ref	isfloating isunkillable*/
+	{ "Gimp",	NULL,		NULL,		NULL,		True , False},
+	{ "UXTerm",	NULL,		NULL,		NULL,		False, True},
 };
 
 /* geometries, s{x,y,w,h} and bh are already initualized here */
diff -up dwm-4.9/dwm.c dwm-4.9-nokill/dwm.c
--- dwm-4.9/dwm.c	2008-04-03 22:57:01.000000000 +0200
+++ dwm-4.9-nokill/dwm.c	2008-04-11 16:44:26.000000000 +0200
@@ -70,7 +70,7 @@ struct Client {
 	int minax, maxax, minay, maxay;
 	long flags;
 	unsigned int bw, oldbw;
-	Bool isbanned, isfixed, isfloating, isurgent;
+	Bool isbanned, isfixed, isfloating, isurgent, isunkillable;
 	Bool *tags;
 	Client *next;
 	Client *prev;
@@ -117,6 +117,7 @@ typedef struct {
 	const char *title;
 	const char *tag;
 	Bool isfloating;
+	Bool isunkillable;
 } Rule;
 
 /* function declarations */
@@ -266,6 +267,7 @@ applyrules(Client *c) {
 		|| (ch.res_name && r->instance && strstr(ch.res_name, r->instance)))
 		{
 			c->isfloating = r->isfloating;
+			c->isunkillable = r->isunkillable;
 			if(r->tag) {
 				c->tags[idxoftag(r->tag)] = True;
 				matched = True;
@@ -967,7 +969,7 @@ void
 killclient(const char *arg) {
 	XEvent ev;
 
-	if(!sel)
+	if(!sel || sel->isunkillable)
 		return;
 	if(isprotodel(sel)) {
 		ev.type = ClientMessage;