diff --git a/src/kernel/libroot/libroot_init.c b/src/kernel/libroot/libroot_init.c
index 1d3d4006c3..cb6a21772a 100644
--- a/src/kernel/libroot/libroot_init.c
+++ b/src/kernel/libroot/libroot_init.c
@@ -25,6 +25,9 @@ char **argv_save;
 	// needed for BeOS compatibility - they are set in the startup code
 	// (have a look at the glue/ directory)
 
+int _data_offset_main_;
+	// this is obviously needed for R4.5 compatiblity
+
 
 void
 initialize_before(image_id imageID, struct uspace_program_args const *args)
diff --git a/src/kernel/libroot/os/arch/x86/thread.c b/src/kernel/libroot/os/arch/x86/thread.c
index 697bb0373c..3b4aed421a 100644
--- a/src/kernel/libroot/os/arch/x86/thread.c
+++ b/src/kernel/libroot/os/arch/x86/thread.c
@@ -1,5 +1,5 @@
-/* 
- * Copyright 2003-2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+/*
+ * Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 
@@ -18,3 +18,16 @@ _kfind_thread_(const char *name)
 {
 	return _kern_find_thread(name);
 }
+
+
+extern thread_id _kget_thread_stacks_(thread_id thread, uint32 *stacks);
+
+status_t
+_kget_thread_stacks_(thread_id thread, uint32 *stacks)
+{
+	// This one is obviously called from the R4.5 startup code. I am not
+	// exactly sure how it returns its infos, but just returning an
+	// error seems to work fine as well
+	return B_ERROR;
+}
+
diff --git a/src/kits/app/Handler.cpp b/src/kits/app/Handler.cpp
index 94192fe937..6502ce95d3 100644
--- a/src/kits/app/Handler.cpp
+++ b/src/kits/app/Handler.cpp
@@ -745,11 +745,6 @@ BHandler::IsWatched() const
 }
 
 
-void BHandler::_ReservedHandler2() {}
-void BHandler::_ReservedHandler3() {}
-void BHandler::_ReservedHandler4() {}
-
-
 void
 BHandler::InitData(const char *name)
 {
@@ -785,6 +780,16 @@ BHandler::SetLooper(BLooper *loop)
 }
 
 
+#ifdef __INTEL__
+// binary compatibility with R4.5
+extern "C" void _ReservedHandler1__8BHandler(void) {}
+#endif
+
+void BHandler::_ReservedHandler2() {}
+void BHandler::_ReservedHandler3() {}
+void BHandler::_ReservedHandler4() {}
+
+
 //	#pragma mark -