diff --git a/flake.nix b/flake.nix
index a167232..fae4f11 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,15 +33,13 @@
           src = ./.;
 
           # from https://discourse.nixos.org/t/is-there-a-way-to-read-a-yaml-file-and-get-back-a-set/18385/5
-          fromYAML =
+          importYAML =
             file:
-            builtins.fromJSON (
-              builtins.readFile (
-                pkgs.runCommand "converted-yaml.json" { } ''${pkgs.yj}/bin/yj < "${file}" > "$out"''
-              )
+            lib.importJSON (
+              pkgs.runCommand "converted-yaml.json" { } ''${pkgs.yj}/bin/yj < "${file}" > "$out"''
             );
 
-          package = fromYAML "${src}/pubspec.yaml";
+          package = importYAML "${src}/pubspec.yaml";
         in
         {
           _module.args.pkgs = import nixpkgs {
@@ -59,6 +57,7 @@
               olm
               git
               clang
+              pkg-config
               (flutter.override { extraPkgConfigPackages = [ pkgs.libsecret ]; })
 
               (pkgs.writeShellScriptBin "rustup" (builtins.readFile ./nix/fake-rustup.sh))
@@ -79,7 +78,7 @@
             pname = package.name;
             version = package.version;
 
-            pubspecLock = fromYAML "${src}/pubspec.lock";
+            pubspecLock = importYAML "${src}/pubspec.lock";
             gitHashes = {
               flutter_chat_ui = "sha256-4fuag7lRH5cMBFD3fUzj2K541JwXLoz8HF/4OMr3uhk=";
               flutter_link_previewer = "sha256-4fuag7lRH5cMBFD3fUzj2K541JwXLoz8HF/4OMr3uhk=";