Origin: upstream, https://github.com/aircrack-ng/mdk4/commit/a214f5cedc0e27060d10a359a1efeaed7d4ab2a3
Index: mdk4/src/Makefile
===================================================================
--- mdk4.orig/src/Makefile
+++ mdk4/src/Makefile
@@ -27,8 +27,7 @@ att:
 osd:
 	$(MAKE) -C $(OSD)
 
-$(LIBOSD) $(OSD)/libosdep.a:
-	$(MAKE) -C $(OSD)
+$(LIBOSD) $(OSD)/libosdep.a: osd
 
 $(OBJ_ATT):
 	$(MAKE) -C $(ATTACKS)