if clean runs in parallel with $(OBJECTS), it is possible to build some
objects first, then the clean target fires and deletes some, and then we
try to link and fail.

https://bugs.gentoo.org/528218

--- a/makefile
+++ b/makefile
@@ -118,7 +118,7 @@
 clean:
 	@rm -f *.o *.bak *~
 
-unrar:	clean $(OBJECTS) $(UNRAR_OBJ)
+unrar:	$(OBJECTS) $(UNRAR_OBJ)
 	$(LINK) -o unrar $(CXXFLAGS) $(LDFLAGS) $(OBJECTS) $(UNRAR_OBJ) $(LIBS)	
 	$(STRIP) unrar