# opterr

- **Language:** C
- **Kind:** constant
- **Source:** https://github.com/tmux/tmux/blob/e476c1230b958df0cb12977517d24b3dc931375b/compat.h#L479
- **Page:** https://libtmux.org/en/tmux/latest/reference/c-define-compat-h-opterr/

```c
#define opterr BSDopterr
```

## Referenced declarations

- [`BSDopterr`](/en/tmux/latest/reference/c-variable-bsdopterr/) (attribute)