libzahl - big integer library

http://git.suckless.org/libzahl/tree/
The rationale for its creation can be found on the README file.
What do you think?

>>3
I'm no suckless dev. I just post their new stuff here to discuss with /prog/.
Anyway, now dc(1) and bc(1) can added to sbase without the need of GNU GMP or other sucky bignum library.