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Set the environment variable GDFONTPATH to the list of directories where fonts are expected to be installed. This is search path is used by same GD-based applications, such as Gnuplot. Alternatively, we could rely on fontconfig to achieve the same thing, i.e. by running for n in $(fc-list | sed -r -e 's|^([^:]+):.*$|\1|'); do echo $(dirname "$n"); done | sort | uniq to get that list at run-time, but the static approach feels more deterministic.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.