Dependency

noun

1. A state of dependence; a refusal to exercise initiative.
2. Something dependent on, or subordinate to, something else:
3. A colony, or a territory subject to rule by an external power.
4. A dependence on a habit-forming substance such as a drug or alcohol; addiction.
5. Reliance on the functionality provided by some other, external component.

   "This library has dependencies on a lot of other libraries. We have to compile all of those other libraries first."