This is the README for PuTTY, a free Windows and Unix Telnet and SSH client. PuTTY 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 . Documentation (in various formats including Windows Help and Unix `man' pages) is built from the Halibut (`.but') files in the `doc' subdirectory using `doc/Makefile'. If you aren't using one of our source snapshots, you'll need to do this yourself. Halibut can be found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>. The PuTTY home web site is https://www.chiark.greenend.org.uk/~sgtatham/putty/ If you want to send bug reports or feature requests, please read the Feedback section of the web site before doing so. Sending one-line reports saying `it doesn't work' will waste your time as much as ours. See the file LICENCE for the licence conditions.