Fixed the compiler errors on Mac OS X; now to get it running...

delegatetypes_darwin.go

@@ -17,13 +17,13 @@ var (
 	_NSObject_Class = C.object_getClass(_NSObject)
 )
 
-func newDelegateClass(name string) (C.Class, error) {
+func makeDelegateClass(name string) (C.Class, error) {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
 	c := C.objc_allocateClassPair(_NSObject_Class, cname, 0)
 	if c == C.NilClass {
-		return fmt.Errorf("unable to create Objective-C class %s; reason unknown", name)
+		return C.NilClass, fmt.Errorf("unable to create Objective-C class %s; reason unknown", name)
 	}
 	C.objc_registerClassPair(c)
 	return c, nil

uitask_darwin.go

@@ -21,6 +21,10 @@ We will create an Objective-C class goAppDelegate. It contains two methods:
 // extern void appDelegate_uitask(id, SEL, id);
 import "C"
 
+// temporary for now
+func msgBox(string, string){}
+func msgBoxError(string, string){}
+
 var uitask chan func()
 
 var mtret chan interface{}
@@ -43,7 +47,7 @@ func ui(initDone chan error) {
 	mtret = make(chan interface{})
 	go mainThread()
 	v := <-mtret
-	if err, ok := v.(error); err {
+	if err, ok := v.(error); ok {
 		initDone <- fmt.Errorf("error initializing Cocoa: %v", err)
 		return
 	}