WANT_SOURCE_INSTALL=1 can be specified when compiling to build NetHack
within the repo/source tree, rather than in the normal system install
location. I find it useful for development on OSX, but it wasn't
present in any other hints files, so I've been using a custom hints file
on Linux for a while that adds the same option. The code is based on
the macOS.370 hints file.
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