Index: isolate.cpp
===================================================================
--- isolate.cpp	(revision 12)
+++ isolate.cpp	(working copy)
@@ -282,7 +282,9 @@
       cmnd = confinement_path + "/tmp/.X11-unix";
       mkdir(cmnd.c_str(), 0777);
       cmnd = LN + " /tmp/.X11-unix/X0 " + confinement_path + "/tmp/.X11-unix/X0";
-      system(cmnd.c_str());
+      if( system(cmnd.c_str()) == -1 ) {
+            cerr << "Warning: Could not execute command \"" << cmnd << "\": " << strerror(errno);
+      }

       restore_privilege();
 }