stdenv.mkDerivation: use `head foo` instead of `elemAt foo 0`

          __ignoreNulls = true;

          inherit __structuredAttrs strictDeps;

          depsBuildBuild = elemAt (elemAt dependencies 0) 0;

          nativeBuildInputs = elemAt (elemAt dependencies 0) 1;

          depsBuildTarget = elemAt (elemAt dependencies 0) 2;

          depsHostHost = elemAt (elemAt dependencies 1) 0;

          depsBuildBuild = head (head dependencies);

          nativeBuildInputs = elemAt (head dependencies) 1;

          depsBuildTarget = elemAt (head dependencies) 2;

          depsHostHost = head (elemAt dependencies 1);

          buildInputs = elemAt (elemAt dependencies 1) 1;

          depsTargetTarget = elemAt (elemAt dependencies 2) 0;

          depsTargetTarget = head (elemAt dependencies 2);

          depsBuildBuildPropagated = elemAt (elemAt propagatedDependencies 0) 0;

          propagatedNativeBuildInputs = elemAt (elemAt propagatedDependencies 0) 1;

          depsBuildTargetPropagated = elemAt (elemAt propagatedDependencies 0) 2;

          depsHostHostPropagated = elemAt (elemAt propagatedDependencies 1) 0;

          depsBuildBuildPropagated = head (head propagatedDependencies);

          propagatedNativeBuildInputs = elemAt (head propagatedDependencies) 1;

          depsBuildTargetPropagated = elemAt (head propagatedDependencies) 2;

          depsHostHostPropagated = head (elemAt propagatedDependencies 1);

          propagatedBuildInputs = elemAt (elemAt propagatedDependencies 1) 1;

          depsTargetTargetPropagated = elemAt (elemAt propagatedDependencies 2) 0;

          depsTargetTargetPropagated = head (elemAt propagatedDependencies 2);

          # This parameter is sometimes a string, sometimes null, and sometimes a list, yuck

          configureFlags =