###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
# SDL_UnsetEnvironmentVariable

Clear a variable from the environment.

## Header File

Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)

## Syntax

```c
bool SDL_UnsetEnvironmentVariable(SDL_Environment *env, const char *name);
```

## Function Parameters

|                                      |          |                                    |
| ------------------------------------ | -------- | ---------------------------------- |
| [SDL_Environment](SDL_Environment) * | **env**  | the environment to modify.         |
| const char *                         | **name** | the name of the variable to unset. |

## Return Value

(bool) Returns true on success or false on failure; call
[SDL_GetError](SDL_GetError)() for more information.

## Thread Safety

It is safe to call this function from any thread.

## Version

This function is available since SDL 3.1.3.

## See Also

- [SDL_GetEnvironment](SDL_GetEnvironment)
- [SDL_CreateEnvironment](SDL_CreateEnvironment)
- [SDL_GetEnvironmentVariable](SDL_GetEnvironmentVariable)
- [SDL_GetEnvironmentVariables](SDL_GetEnvironmentVariables)
- [SDL_SetEnvironmentVariable](SDL_SetEnvironmentVariable)
- [SDL_UnsetEnvironmentVariable](SDL_UnsetEnvironmentVariable)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)