Add on top of default.nix: with import {}; or simply run as nix-build '' (i. e. for nix-build complaining) or rather nix-build -E 'with import {}; callPackage ./default.nix {}' (or even import)
Add on top of default.nix: with import {}; or simply run as nix-build '' (i. e. for nix-build complaining) or rather nix-build -E 'with import {}; callPackage ./default.nix {}' (or even import)