Why is BGL_STACKOVERFLOW_SIZE_THRESHOLD a constant?

[svenha]

The value of BGL_STACKOVERFLOW_SIZE_THRESHOLD is 8192, a typical value for the stack size limit. I have to use larger stack size limits and hence (without much understanding and consideration) disabled the rlimit feature (getrlimitfull inconfigure) some years ago.

But would not it be better to use a variable BGL_STACKOVERFLOW_SIZE_THRESHOLD which is set from the limit at the start of the bigloo program?