Missing header file divsufsort.h

Hello,

research/durchschlag.cc wants to include divsufsort.h, but I can't find it anywhere.

Steps to reproduce:

g++ -o durschlag.o research/durchschlag.cc

Result:

research/durchschlag.cc:6:10: fatal error: divsufsort.h: No such file or directory
    6 | #include <divsufsort.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.

Version: 037b70e2ad03b20480e6407ed5851e0f114b67a7 OS: Gentoo Linux Compiler: g++ (Gentoo Hardened 15.3.0 p8) 15.3.0