# FAQ

Answers to common questions.

## I built Fun but includes aren't found
Set `FUN_LIB_DIR` to the repository's `./lib` directory when running without installation:
```
FUN_LIB_DIR=./lib ./build/fun examples/hello.fun
```
See [includes.md](./includes.md).

## How do I start the REPL?
Run `fun -i` (or run `fun` without a script, depending on version). See [repl.md](./repl.md).

## Which build target should I use?
Use the aggregate `build` target to build `fun`, `fun_test`, and `test_opcodes`. See [build.md](./build.md).

## Where are the standard libraries?
Under [`./lib/`](../lib/). See [stdlib.md](./stdlib.md) for an overview.

## Where can I find internals and opcodes?
Browse [src/vm](../src/vm/) and [internals.md](./internals.md) / [opcodes.md](./opcodes.md).