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Apparently some compilers can't work out that new_window() will always write to its error-message parameter if it returns failure, so they complain at the call site that 'error' might be used uninitialised. Fix by explicitly initialising it. (To NULL, which really _shouldn't_ stop the compiler from warning, because surely that's just as bad if it reaches the following printf!) Also, while I'm at it, move it into the block where it's used, so it doesn't look as if it might pervade the whole of main().
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/>.