make: don't know how to make test. Stop - BBS

系統是 FreeBSD 7.0R
我用 ports make好套件之後
訊息寫著：

Build complete.
Don't forget to run 'make test'.

我就接著輸入 make test
結果它顯示：
www# make test
make: don't know how to make test. Stop
www#

請問這是什麼原因?

--