Scrotwm LD_PRELOADs a small library when spawning an external application; if
the library is not present, however, every time a command is launched from a
terminal spawned by scrotwm a warning message is shown.

This patch checks the library exists before LD_PRELOADing it, so even if the
library is not installed (which is the case for the Debian package) the user
is not annoyed by spurious warning messages.
Index: scrotwm/scrotwm.c
===================================================================
--- scrotwm.orig/scrotwm.c	2009-05-31 19:36:32.000000000 +0200
+++ scrotwm/scrotwm.c	2009-05-31 19:36:46.000000000 +0200
@@ -1086,6 +1086,7 @@
 {
 	char			*ret;
 	int			si;
+    struct stat sb;
 
 	DNPRINTF(SWM_D_MISC, "spawn: %s\n", args->argv[0]);
 	/*
@@ -1096,7 +1097,10 @@
 		if (fork() == 0) {
 			if (display)
 				close(ConnectionNumber(display));
-      			setenv("LD_PRELOAD", SWM_LIB, 1);
+            if (stat(SWM_LIB, &sb) != -1) {
+                if (S_ISREG(sb.st_mode))
+                    setenv("LD_PRELOAD", SWM_LIB, 1);
+            }
 			if (asprintf(&ret, "%d", r->ws->idx)) {
 				setenv("_SWM_WS", ret, 1);
 				free(ret);