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diff --git a/rts/GCCompact.h b/rts/GCCompact.h
new file mode 100644
index 0000000..0fb39b3
--- /dev/null
+++ b/rts/GCCompact.h
@@ -0,0 +1,44 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team 1998-2005
+ *
+ * Compacting garbage collector
+ *
+ * ---------------------------------------------------------------------------*/
+
+#ifndef GCCOMPACT_H
+#define GCCOMPACT_H
+
+STATIC_INLINE void 
+mark(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    *bitmap_word |= bit_mask;
+}
+
+STATIC_INLINE void 
+unmark(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    *bitmap_word &= ~bit_mask;
+}
+
+STATIC_INLINE StgWord
+is_marked(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    return (*bitmap_word & bit_mask);
+}
+
+void compact( void (*get_roots)(evac_fn) );
+
+#endif /* GCCOMPACT_H */