What is meant by term in brackets for cmake command?

Question

What's meant in the line (https://scipopt.org/doc/html/CMAKE.php)

cmake .. [-DSOPLEX_DIR=/path/to/soplex]

What to put as [-DSOPLEX_DIR=/path/to/soplex]?

Answer 1

Square brackets denote optional arguments. In other words, you could use the argument -DSOPLEX_DIR=/path/to/soplex, or you could omit it.