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---
layout: page
published: true
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noToc: false
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noComments: false
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title: Fun - FAQ
subtitle: Frequently asked questions and quick answers.
description: Frequently asked questions and quick answers.
permalink: /documentation/faq/
lang: en
tags:
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- answers
- asked
- faq
- frequently
- questions
- quick
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---
Answers to common questions.
## I built Fun but includes aren't found
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Set `FUN_LIB_DIR` to the repository's `./lib` directory when running without installation:
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<pre>FUN_LIB_DIR=./lib ./build/fun examples/hello.fun
</pre>
See [includes/ ](../includes/ ).
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## How do I start the REPL?
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Run `fun -i` (or run `fun` without a script, depending on version). See [repl/ ](../repl/ ).
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## Which build target should I use?
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Use the aggregate `build` target to build `fun` , `fun_test` , and `test_opcodes` . See [build/ ](../build/ ).
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## Where are the standard libraries?
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Under [https://git.xw3.org/fun/fun/src/branch/main/lib ](https://git.xw3.org/fun/fun/src/branch/main/lib ){:class="git"}. See [stdlib/ ](../stdlib/ ) for an overview.
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## Where can I find internals and opcodes?
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Browse [https://git.xw3.org/fun/fun/src/branch/main/src/vm ](https://git.xw3.org/fun/fun/src/branch/main/src/vm/ ) and [internals/ ](../internals/ ) / [opcodes/ ](../opcodes/ ).
