diff --git a/Meta/gn/build/mac/compile_xib_resources.gni b/Meta/gn/build/mac/compile_xib_resources.gni
new file mode 100644
index 00000000000..f2f5e2e8a8d
--- /dev/null
+++ b/Meta/gn/build/mac/compile_xib_resources.gni
@@ -0,0 +1,37 @@
+#
+# This file introduces a template for compiling Apple platform interface
+# builder files.
+#
+# The output files will be placed in $target_gen_dir with the source name
+# suffix-replaced from "Foo.xib" to "Foo.nib"
+#
+# Example use:
+#
+#    compile_xib_resources("my_nibs") {
+#      sources = [
+#        "A.xib",
+#        "B.xib",
+#      ]
+#    }
+#
+
+template("compile_xib_resources") {
+  action_foreach(target_name) {
+    forward_variables_from(invoker, [ "sources" ])
+
+    script = "//Meta/gn/build/invoke_process_with_args.py"
+
+    outputs = [ "$target_gen_dir/{{source_name_part}}.nib" ]
+    args = [
+      "ibtool",
+      "--errors",
+      "--warnings",
+      "--notices",
+      "--output-format",
+      "human-readable-text",
+      "--compile",
+      rebase_path(target_gen_dir, root_build_dir) + "/{{source_name_part}}.nib",
+      "{{source}}",
+    ]
+  }
+}
diff --git a/Meta/gn/secondary/BUILD.gn b/Meta/gn/secondary/BUILD.gn
index 0434b528237..62032ccfb84 100644
--- a/Meta/gn/secondary/BUILD.gn
+++ b/Meta/gn/secondary/BUILD.gn
@@ -15,6 +15,12 @@ group("serenity") {
   deps = [ "//Kernel(//Meta/gn/build/toolchain:serenity)" ]
 }
 
+group("macpdf") {
+  if (current_os == "mac") {
+    deps = [ "//Meta/Lagom/Contrib/MacPDF" ]
+  }
+}
+
 # A pool called "console" in the root BUILD.gn is magic and represents ninja's
 # built-in console pool. (Requires a GN with `gn --version` >= 552353.)
 pool("console") {
diff --git a/Meta/gn/secondary/Meta/Lagom/Contrib/MacPDF/BUILD.gn b/Meta/gn/secondary/Meta/Lagom/Contrib/MacPDF/BUILD.gn
new file mode 100644
index 00000000000..f9bd8eff828
--- /dev/null
+++ b/Meta/gn/secondary/Meta/Lagom/Contrib/MacPDF/BUILD.gn
@@ -0,0 +1,104 @@
+import("//Meta/gn/build/mac/compile_xib_resources.gni")
+
+assert(current_os == "mac", "This application is macOS specific")
+
+group("MacPDF") {
+  deps = [ ":MacPDF.app" ]
+}
+
+compile_xib_resources("pdf_nibs") {
+  sources = [ "MainMenu.xib" ]
+}
+
+executable("MacPDF_executable") {
+  include_dirs = [
+    "//Userland/Libraries",
+    "//Userland/Services",
+  ]
+  defines = [ "AK_DONT_REPLACE_STD" ]
+  cflags_objcc = [ "-fobjc-arc" ]
+  deps = [
+    ":pdf_nibs",
+    "//AK",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibGfx",
+    "//Userland/Libraries/LibPDF",
+  ]
+  frameworks = [
+    "Cocoa.framework",
+    "UniformTypeIdentifiers.framework",
+  ]
+  sources = [
+    "AppDelegate.mm",
+    "MacPDFDocument.mm",
+    "MacPDFOutlineViewDataSource.mm",
+    "MacPDFView.mm",
+    "MacPDFWindowController.mm",
+    "main.mm",
+  ]
+  output_name = "MacPDF"
+}
+
+bundle_data("pdf_bundle_info_plist") {
+  sources = [ "Info.plist" ]
+  outputs = [ "{{bundle_contents_dir}}/Info.plist" ]
+}
+
+bundle_data("pdf_bundle_executables") {
+  public_deps = [ ":MacPDF_executable" ]
+  sources = [ "$root_out_dir/bin/MacPDF" ]
+  outputs = [ "{{bundle_executable_dir}}/{{source_file_part}}" ]
+}
+
+bundle_data("pdf_bundle_libs") {
+  public_deps = [
+    "//Userland/Libraries/LibCompress",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibCrypto",
+    "//Userland/Libraries/LibFileSystem",
+    "//Userland/Libraries/LibGfx",
+    "//Userland/Libraries/LibIPC",
+    "//Userland/Libraries/LibPDF",
+    "//Userland/Libraries/LibTextCodec",
+  ]
+  sources = [
+    "$root_out_dir/lib/liblagom-compress.dylib",
+    "$root_out_dir/lib/liblagom-core.dylib",
+    "$root_out_dir/lib/liblagom-crypto.dylib",
+    "$root_out_dir/lib/liblagom-filesystem.dylib",
+    "$root_out_dir/lib/liblagom-gfx.dylib",
+    "$root_out_dir/lib/liblagom-ipc.dylib",
+    "$root_out_dir/lib/liblagom-pdf.dylib",
+    "$root_out_dir/lib/liblagom-textcodec.dylib",
+  ]
+  outputs = [ "{{bundle_contents_dir}}/lib/{{source_file_part}}" ]
+}
+
+bundle_data("pdf_bundle_nibs") {
+  public_deps = [ ":pdf_nibs" ]
+  sources = get_target_outputs(":pdf_nibs")
+  outputs = [ "{{bundle_resources_dir}}" + "{{source_file_part}}" ]
+}
+
+bundle_data("pdf_resources") {
+  # FIXME: Don't list directories here, list out the files directly
+  sources = [ "//Base/res/fonts" ]
+  outputs = [ "{{bundle_resources_dir}}/res/" + "{{source_file_part}}" ]
+}
+
+create_bundle("MacPDF.app") {
+  product_type = "com.apple.product-type.application"
+
+  bundle_root_dir = "$root_build_dir/$target_name"
+  bundle_contents_dir = "$bundle_root_dir/Contents"
+  bundle_resources_dir = "$bundle_contents_dir/Resources"
+  bundle_executable_dir = "$bundle_contents_dir/MacOS"
+
+  deps = [
+    ":pdf_bundle_executables",
+    ":pdf_bundle_info_plist",
+    ":pdf_bundle_libs",
+    ":pdf_bundle_nibs",
+    ":pdf_resources",
+  ]
+}