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This reinstates the feature of the previous build system, that the C icon files for the GTK puzzles were included in the source tarball, so that users building from that instead of from the raw git repo would not need to run the fiddly piece of build that regenerates them. Running that fiddly piece of build is much easier in the CMake world (because it's integrated with the main makefile), but it has a build dependency on ImageMagick which is easily avoided. The makefile will still build the icons if it _can_. But in the case where it can't, it will use pre-built icon source files if they're available, and only fall back to no-icon.c if it can't even do that. (So a user checking out from git and building without ImageMagick present will still be able to build _something_ playable.)
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/>.