diff --git a/lfs/whatmask b/lfs/whatmask
index 4ac05dfb3..fc572edcd 100644
--- a/lfs/whatmask
+++ b/lfs/whatmask
@@ -73,6 +73,7 @@ $(subst %,%_BLAKE2,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
+	cd $(DIR_APP) && autoreconf -vfi
 	cd $(DIR_APP) && ./configure --prefix=/usr
 	cd $(DIR_APP) && make $(MAKETUNING)
 	cd $(DIR_APP) && make install