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In POSIX sh, `local` is undefined.

Problematic code:

myfunc() {
  local i=0
  ..
}

Correct code:

In POSIX sh, you can adopt some convention to avoid accidentally overwriting variables names, e.g. prefixing with the function name:

myfunc() {
  _myfunc_i=0
  ..
}

Rationale:

local is supported in many shells, including bash, ksh, dash, and BusyBox ash. However, it is not specified by POSIX.

Exceptions:

Since quite a lot of real world shells support this feature, you may decide to ignore the warning.

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