diff -up M2/Macaulay2/d/M2lib.c.bz201739 M2/Macaulay2/d/M2lib.c
--- M2/Macaulay2/d/M2lib.c.bz201739	2011-08-27 11:36:47.000000000 -0500
+++ M2/Macaulay2/d/M2lib.c	2013-05-21 09:45:37.113850573 -0500
@@ -598,7 +598,19 @@ char **argv;
 	       personality(oldpersonality | ADDR_NO_RANDOMIZE);
 	       newpersonality = personality(-1);
 	       personality(oldpersonality | ADDR_NO_RANDOMIZE);	/* just in case the previous line sets the personality to -1, which can happen */
-	       if ((newpersonality & ADDR_NO_RANDOMIZE) != 0) return execvp(argv[0],argv);
+	       if ((newpersonality & ADDR_NO_RANDOMIZE) != 0) {
+		       /* Sometimes the personality isn't inherited.
+			  Prevent endless loops by adding --no-personality to
+			  the command line */
+		       char **new_argv = malloc((argc+2) * sizeof(char *));
+		       if (!new_argv) fatal("out of memory");
+
+		       new_argv[0] = argv[0];
+		       new_argv[1] = "--no-personality";
+		       memcpy(&new_argv[2], &argv[1], sizeof(char *) * (argc));
+		       
+		       return execvp(new_argv[0],new_argv);
+	       }
 	  }
 	  else personality(oldpersonality);
      }