Motivation for this change

The mkgmap program takes OpenStreetMap data and generates a map in the Garmin .img file format so that it can be loaded onto compatible GPS units.
http://www.mkgmap.org.uk/

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

$ nix path-info -Sh ./result
/nix/store/2ww7c5qlh1kcl4rl2phh2ifsdmjcsdl6-mkgmap-r4289	 386.7M
$ tree result/
result/
├── bin
│   └── mkgmap
└── share
    ├── java
    │   └── mkgmap
    │       ├── lib
    │       │   ├── 0fi30jxc65ny98vqns4rgdghg9z0l904-osmpbf.jar
    │       │   ├── aq2zp403ym0v91i7hdf6mk7nd9d7g61z-protobuf-java-2.5.0.jar
    │       │   └── qanpvgsz9d5ykvfjsanrhhmcpyc1zxhr-fastutil.jar
    │       └── mkgmap.jar
    └── man
        └── man1
            └── mkgmap.1.gz

7 directories, 6 files