fix build

flake.nix

@@ -7,10 +7,17 @@
   let
     system = "x86_64-linux";
     rubyVer = "ruby_3_1";
-    bundlerApp = pkgs: ruby: pkgs.bundlerApp {
-      pname = "danbooru";
+    bundlerEnv = pkgs: ruby: pkgs.bundlerEnv {
+      name = "danbooru";
       inherit ruby;
       gemdir = ./.;
+      gemset =
+        let gems = import ./gemset.nix;
+        in gems // {
+          dtext_rb = gems.dtext_rb // {
+            buildInputs = [ pkgs.pkg-config pkgs.glib ];
+          };
+        };
       buildInputs = [ pkgs.pkg-config pkgs.glib ];
     };
     overlay = final: prev: rec {
@@ -25,7 +32,7 @@
           sha256 = "sha256-0CMDJR3xfewNuDthm3fEh6UPeRH9PURYxJ0PI1WPv4U=";
         };
       });
-      danbooru = bundlerApp final final.ruby;
+      danbooru = bundlerEnv final final.ruby;
     };
     pkgs = (import nixpkgs {
       inherit system;