This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
-<http://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.
+<https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.
If you've obtained the source code by downloading a .tar.gz archive
from the Puzzles web site, you should find several Makefiles in the
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
-<http://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
+<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.