--- dyld/dyld-519.2.1/src/ImageLoaderMachOCompressed.cpp
+++ dyld/dyld-551.3/src/ImageLoaderMachOCompressed.cpp
@@ -156,10 +156,6 @@
 
 		// make sure path is stable before recording in dyld_all_image_infos
 		image->setMapped(context);
-
-		// dylibs with thread local variables cannot be unloaded because there is no way to clean up all threads
-		if ( image->machHeader()->flags & MH_HAS_TLV_DESCRIPTORS )
-			image->setNeverUnload();
 
 		// pre-fetch content of __DATA and __LINKEDIT segment for faster launches
 		// don't do this on prebound images or if prefetching is disabled