# SDL_SetEnvironmentVariable Set the value of a variable in 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_SetEnvironmentVariable(SDL_Environment *env, const char *name, const char *value, bool overwrite); ``` ## Function Parameters | | | | | ------------------------------------ | ------------- | ----------------------------------------------------------------------------------------------------------------------- | | [SDL_Environment](SDL_Environment) * | **env** | the environment to modify. | | const char * | **name** | the name of the variable to set. | | const char * | **value** | the value of the variable to set. | | bool | **overwrite** | true to overwrite the variable if it exists, false to return success without setting the variable if it already exists. | ## 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 3.2.0. ## See Also - [SDL_GetEnvironment](SDL_GetEnvironment) - [SDL_CreateEnvironment](SDL_CreateEnvironment) - [SDL_GetEnvironmentVariable](SDL_GetEnvironmentVariable) - [SDL_GetEnvironmentVariables](SDL_GetEnvironmentVariables) - [SDL_UnsetEnvironmentVariable](SDL_UnsetEnvironmentVariable) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)