diff -wur ruby-1.8.6/error.c ruby-1.8.6-sandbox/error.c
--- ruby-1.8.6/error.c	2007-02-12 15:01:19.000000000 -0500
+++ ruby-1.8.6-sandbox/error.c	2007-04-16 08:06:08.000000000 -0500
@@ -827,7 +827,7 @@
  *     Errno.constants   #=> E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, ...
  */
 
-static st_table *syserr_tbl;
+st_table *rb_syserr_tbl;
 
 static VALUE
 set_syserr(n, name)
@@ -836,10 +836,10 @@
 {
     VALUE error;
 
-    if (!st_lookup(syserr_tbl, n, &error)) {
+    if (!st_lookup(rb_syserr_tbl, n, &error)) {
 	error = rb_define_class_under(rb_mErrno, name, rb_eSystemCallError);
 	rb_define_const(error, "Errno", INT2NUM(n));
-	st_add_direct(syserr_tbl, n, error);
+	st_add_direct(rb_syserr_tbl, n, error);
     }
     else {
 	rb_define_const(rb_mErrno, name, error);
@@ -853,7 +853,7 @@
 {
     VALUE error;
 
-    if (!st_lookup(syserr_tbl, n, &error)) {
+    if (!st_lookup(rb_syserr_tbl, n, &error)) {
 	char name[8];	/* some Windows' errno have 5 digits. */
 
 	snprintf(name, sizeof(name), "E%03d", n);
@@ -891,7 +891,7 @@
 	if (argc == 1 && FIXNUM_P(mesg)) {
 	    error = mesg; mesg = Qnil;
 	}
-	if (!NIL_P(error) && st_lookup(syserr_tbl, NUM2LONG(error), &klass)) {
+	if (!NIL_P(error) && st_lookup(rb_syserr_tbl, NUM2LONG(error), &klass)) {
 	    /* change class */
 	    if (TYPE(self) != T_OBJECT) { /* insurance to avoid type crash */
 		rb_raise(rb_eTypeError, "invalid instance type");
@@ -1031,7 +1031,7 @@
     rb_eSecurityError = rb_define_class("SecurityError", rb_eStandardError);
     rb_eNoMemError = rb_define_class("NoMemoryError", rb_eException);
 
-    syserr_tbl = st_init_numtable();
+    rb_syserr_tbl = st_init_numtable();
     rb_eSystemCallError = rb_define_class("SystemCallError", rb_eStandardError);
     rb_define_method(rb_eSystemCallError, "initialize", syserr_initialize, -1);
     rb_define_method(rb_eSystemCallError, "errno", syserr_errno, 0);