I have been replacing my use of base-style with 'include' statements and encountered a problem using eg 'include "points" from default;'. When I do this, mkgmap reports that it can't find 'inc/address' , which is included in the default style points file. It turns out that mkgmap is looking for it in my style directory, rather than in the built-in inc location where the default style is located. To work around this, I had to copy the 'inc' directory from mkgmap.jar to my custom style directory. Not an ideal solution, since I would have to do this every time I update mkgmap.