Environment variables

These are very few environment variables that can be used to configure some of the Conan behavior. These variables are the exception, for customization and configuration control, Conan uses the global.conf configuration and the profile [conf] section


This variable controls the location of the Conan home folder. By default, if it is not defined, it will be <username>/.conan2.


Recall that the Conan package cache, contained in the Conan home, is not concurrent. Different parallel tasks like those that can happen in CI, need to use a separate cache, and defining CONAN_HOME is the way to do it.


The default profile will be the "default" file in the Conan cache. This environment variable allows to define a different default name. There are also conf items core:default_profile and core:default_build_profile to define such default profile names, this env-var should be used only when the conf is not enough.

Remote login variables

CONAN_LOGIN_USERNAME, CONAN_LOGIN_USERNAME_{REMOTE_NAME} define the login username for a given remote. CONAN_PASSWORD, CONAN_PASSWORD_{REMOTE_NAME} define the login password for a given remote.

These environment variables are just a substitute of the interactive input of the username or password when Conan CLI requests it. They do not perform any kind of authentication unless the remote server throws an authentication challenge. That means that for some remote servers configured to allow anonymous usage, these will not be used, and the user will remain as an unauthenticated user, unless a conan remote login or conan remote auth is done first.

When the Conan CLI is about to ask the user for the remote password, it will check the variable CONAN_LOGIN_USERNAME_{REMOTE_NAME} or CONAN_PASSWORD_{REMOTE_NAME} first, if the variable is not declared Conan will try to use the variable CONAN_LOGIN_USERNAME and CONAN_PASSWORD respectively, if the variable is not declared either, Conan will request to the user to input a password or fail.

The remote name is transformed to all uppercase. If the remote name contains “-“, you have to replace it with “_” in the variable name.


  • These variables are useful for unattended executions like CI servers or automated tasks, as CI secrets
  • These variables are not recommended for developer machines.
  • Recall that these variables do not perform authentication unless the remote server requests it.
  • The core:non_interactive conf can be defined in global.conf to force Conan to fail if any interactive prompt is requested, to avoid CI process being stuck.

Terminal color variables

Conan default behavior is try to autodetect the output. If the output is redirected to a file, or other support not tty, that cannot print colors, it will disable colored output. For regular terminals, it will try to do colored output, unless some of the following change that behavior:

  • CLICOLOR_FORCE Forces the generation of terminal color escape characters, no matter what the autodetection of terminal is.
  • NO_COLOR disables the generation of color escape characters. This will be ignored if CLICOLOR_FORCE is activated.
  • CONAN_COLOR_DARK will revert the color scheme for white/light background terminals (default assumes dark background).