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(environmental-variables)=
# Environmental variables
(TMUXP_CONFIGDIR)=
## `TMUXP_CONFIGDIR`
Example: `TMUXP_CONFIGDIR=$HOME/.mytmuxpconfigdir tmuxp load cpython`
(LIBTMUX_TMUX_FORMAT_SEPARATOR)=
## `LIBTMUX_TMUX_FORMAT_SEPARATOR`
:::{seealso}
[`LIBTMUX_TMUX_FORMAT_SEPARATOR`](https://libtmux.git-pull.com/api.html#tmux-format-separator) in libtmux API.
:::
In rare circumstances the `tmux -F` separator under the hood may cause issues
building sessions. For this case you can override it here.
```console
$ env LIBTMUX_TMUX_FORMAT_SEPARATOR='__SEP__' tmuxp load [session]
```
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