The MacOS build on the page is quite old, and doesn't reflect recent fixes/enhancements. If you want to build it from source for MacOS the included instructions won't work because Simon's 'halibut' documentation tool will be missing.

So you need to:

1) Build Halibut from source:

   git clone https://git.tartarus.org/simon/halibut.git
   cd halibut
   cmake -B build -DCMAKE_BUILD_TYPE=Release
   cmake --build build -j
   # binary lands at: halibut/build/halibut

   cd /path/to/puzzles
   cmake -B build-osx -DCMAKE_BUILD_TYPE=Release \
       -DHALIBUT=/full/path/to/halibut/build/halibut
   cmake --build build-osx -j

   cd build-osx && cpack