The reason you hit this is because you have the GNU
mktemp as the first item in your path.
You can verify this by running,
type -a mktemp. If you don't see
/usr/bin/mktemp as the first option then that is likely your issue.
For example I have:
❯ type -a mktemp
mktemp is /usr/local/opt/coreutils/libexec/gnubin/mktemp
mktemp is /usr/bin/mktemp
The reason I hit this is that I have run
brew install coreutils, and then followed the option in the caveats section:
Commands also provided by macOS have been installed with the prefix "g".
If you need to use these commands with their normal names, you
can add a "gnubin" directory to your PATH from your bashrc like:
This can put the GNU
mktemp ahead of the macOS one.
The fix is simply to stop doing that, remove the above line and just use the g-prefixed versions (e.g.
gmktemp) when you need GNU tools.