diff --git a/linkhack.rs b/linkhack.rs
index 17e7c3692..26848b80e 100644
--- a/linkhack.rs
+++ b/linkhack.rs
@@ -6,12 +6,14 @@
 
 #[cfg(target_os = "linux")]
 #[link(name = "pthread")]
+#[link(name = "nspr4")]
 #[link(name = "js_static")]
 #[link(name = "stdc++")]
 #[link(name = "z")]
 extern { }
 
 #[cfg(target_os = "macos")]
+#[link(name = "nspr4")]
 #[link(name = "js_static")]
 #[link(name = "stdc++")]
 #[link(name = "z")]
diff --git a/rust.rs b/rust.rs
index df2c640f0..2406069c8 100644
--- a/rust.rs
+++ b/rust.rs
@@ -6,9 +6,7 @@
 
 use libc::types::os::arch::c95::{size_t, c_uint};
 use libc::c_char;
-use std::cmp;
 use std::rc;
-use std::rt::Runtime;
 use jsapi::*;
 use jsval::{JSVal, NullValue};
 use default_stacksize;
@@ -18,7 +16,6 @@ use JSOPTION_METHODJIT;
 use JSOPTION_TYPE_INFERENCE;
 use ERR;
 use std::str::raw::from_c_str;
-use green::task::GreenTask;
 
 // ___________________________________________________________________________
 // friendly Rustic API to runtimes
@@ -56,22 +53,9 @@ impl RtUtils for rc::Rc<rt_rsrc> {
     }
 }
 
-extern fn gc_callback(rt: *mut JSRuntime, _status: JSGCStatus) {
-    use std::rt::local::Local;
-    use std::rt::task::Task;
-    unsafe {
-        let mut task = Local::borrow(None::<Task>);
-        let green_task: Box<GreenTask> = task.maybe_take_runtime().unwrap();
-        let (start, end) = green_task.stack_bounds();
-        JS_SetNativeStackBounds(rt, cmp::min(start, end), cmp::max(start, end));
-        task.put_runtime(green_task);
-    }
-}
-
 pub fn rt() -> rt {
     unsafe {
         let runtime = JS_Init(default_heapsize);
-        JS_SetGCCallback(runtime, Some(gc_callback));
         return new_runtime(runtime);
     }
 }
@@ -174,6 +158,7 @@ pub extern fn reportError(_cx: *mut JSContext, msg: *c_char, report: *mut JSErro
 
 pub fn with_compartment<R>(cx: *mut JSContext, object: *mut JSObject, cb: || -> R) -> R {
     unsafe {
+        let _ar = JSAutoRequest::new(cx);
         let call = JS_EnterCrossCompartmentCall(cx, object);
         let result = cb();
         JS_LeaveCrossCompartmentCall(call);
@@ -181,6 +166,30 @@ pub fn with_compartment<R>(cx: *mut JSContext, object: *mut JSObject, cb: || ->
     }
 }
 
+
+pub struct JSAutoRequest {
+    cx: *mut JSContext,
+}
+
+impl JSAutoRequest {
+    pub fn new(cx: *mut JSContext) -> JSAutoRequest {
+        unsafe {
+            JS_BeginRequest(cx);
+        }
+        JSAutoRequest {
+            cx: cx,
+        }
+    }
+}
+
+impl Drop for JSAutoRequest {
+    fn drop(&mut self) {
+        unsafe {
+            JS_EndRequest(self.cx);
+        }
+    }
+}
+
 #[cfg(test)]
 pub mod test {
     use super::rt;