---
name: "env"
section: "3caca"
platform: "linux"
package: "libcucul-dev"
version: "0.99.beta11.debian-2"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/env/3caca"
---

# env(3caca)

Environment variables Some environment variables can be used to change the behaviour of libcaca without having to modify the program which uses them. These variables are:

## NAME

env - Environment variables Some environment variables can be used to change the behaviour of *libcaca* without having to modify the program which uses them. These variables are:

- •

  **CACA\_DRIVER:** set the backend video driver. In order of preference:

- •

  `conio` uses the DOS conio.h interface.

- •

  `ncurses` uses the ncurses library.

- •

  `slang` uses the S-Lang library.

- •

  `x11` uses the native X11 driver.

- •

  `gl` uses freeglut and opengl libraries.

- •

  `raw` outputs to the standard output instead of rendering the canvas. This is can be used together with cacaserver.

- •

  **CACA\_GEOMETRY:** set the video display size. The format of this variable must be `XxY`, with `X` and `Y` being integer values. This option currently works with the raw, X11 and GL drivers.

- •

  **CACA\_FONT:** set the rendered font. The format of this variable is implementation dependent, but since it currently only works with the X11 driver, an X11 font name such as `fixed` or `5x7` is expected.