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I noticed while hacking on hat-test recently that it's quite awkward to be compiling a test main() program that lives in a source file also built into the Puzzles support library, because every modification to main() also triggers a rebuild of the library, and thence of all the actual puzzles. So it's better if such a test main() has its own source file. In order to make hat-test work standalone, I've had to move a lot of hat.c's internal declarations out into a second header file. This also means making a bunch of internal functions global, which means they're also in the namespace of programs other than hat-test, which means in turn that they should have names with less implicit context.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.