Attempting to build metakit

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So, I’m trying to build the metakit library (It’s a dependency for a C++ thing I’m trying to build). GitHub - jnorthrup/metakit: Metakit is an efficient embedded database library with a small footprint
I noticed that there are some build instructions for this in the readme which says the following:

UNIX (ALSO MAC OS X)

    It is no longer advised to build the Unix code in the "unix/" directory.
    Instead, you should perform the following steps:
        cd builds
        sh ../unix/configure
        make
        make test
    And optionally (this only installs the core lib, not script extensions):
        make install

I’ve tried to convert this to a simple flake.nix (NB: I have forked the repo and put the flake.nix into that fork):

{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";
    pkgs = import nixpkgs {inherit system;};
  in {
    packages.${system}.default =
      pkgs.stdenv.mkDerivation
      {
        name = "metakit-.2.4.9.7";
        src = ./.;
        inherit system;
        buildPhase = ''
          cd builds
          ../unix/configure
          make
        '';
        installPhase = ''
          make install
        '';
      };
  };
}

Running nix build fails with the following error (slightly modified for brevity):

error: builder for '/nix/store/8j89xmcbnnpgxlb7l0cwrghc3z9py4i0-metakit-.2.4.9.7.drv' failed with exit code 2;
       last few log lines:
      > Running phase: installPhase
      > mkdir -p /usr/local/include /usr/local/lib
      > mkdir: cannot create directory '/usr': Permission denied
      > mkdir: cannot create directory '/usr': Permission denied
      > make: *** [Makefile:95: install-mk] Error 1
2

Changing the flake to have it run ../unix/configure --prefix=$out in the configurelPhase seems to have fixed my issue here.

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