diff --git a/.gitea/workflows/prebuilt.yml b/.gitea/workflows/prebuilt.yml
new file mode 100644
index 0000000..347ffa1
--- /dev/null
+++ b/.gitea/workflows/prebuilt.yml
@@ -0,0 +1,99 @@
+name: Prebuilt release
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  releases: write
+
+jobs:
+  prebuilt:
+    runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Install nightly Rust
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          targets: x86_64-pc-windows-gnu
+
+      - name: Install MinGW and packaging tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mingw-w64 zip unzip jq
+
+      - name: Build release binaries
+        env:
+          CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER: x86_64-w64-mingw32-gcc
+        run: cargo build --release --target x86_64-pc-windows-gnu -p ext -p launcher
+
+      - name: Package prebuilt release
+        run: |
+          set -euo pipefail
+
+          rm -rf dist
+          mkdir -p dist
+          cp target/x86_64-pc-windows-gnu/release/hkrpg.dll dist/
+          cp target/x86_64-pc-windows-gnu/release/launcher.exe dist/
+
+          test -f dist/hkrpg.dll
+          test -f dist/launcher.exe
+
+          (
+            cd dist
+            zip -9 -q ../hkrpg.zip hkrpg.dll launcher.exe
+          )
+          unzip -l hkrpg.zip
+
+      - name: Publish prebuilt release
+        env:
+          GITEA_API_URL: ${{ gitea.server_url }}/api/v1
+          GITEA_REPOSITORY: ${{ gitea.repository }}
+          GITEA_SHA: ${{ gitea.sha }}
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        run: |
+          set -euo pipefail
+
+          api="${GITEA_API_URL}"
+          repo="${GITEA_REPOSITORY}"
+          tag="prebuilt"
+          auth=(-H "Authorization: token ${GITEA_TOKEN}" -H "Accept: application/json")
+
+          release_status="$(curl -sS "${auth[@]}" -o release.json -w '%{http_code}' \
+            "${api}/repos/${repo}/releases/tags/${tag}" || true)"
+
+          case "${release_status}" in
+            200)
+              ;;
+            404)
+              curl -fsS -X POST "${auth[@]}" \
+                -H "Content-Type: application/json" \
+                -d "{\"tag_name\":\"${tag}\",\"target_commitish\":\"${GITEA_SHA}\",\"name\":\"${tag}\",\"body\":\"Automated prebuilt binaries for ${GITEA_SHA}\",\"draft\":false,\"prerelease\":false}" \
+                "${api}/repos/${repo}/releases" > release.json
+              ;;
+            *)
+              cat release.json
+              exit 1
+              ;;
+          esac
+
+          release_id="$(jq -er '.id' release.json)"
+          assets="$(curl -fsS "${auth[@]}" \
+            "${api}/repos/${repo}/releases/${release_id}/assets")"
+
+          while read -r asset_id; do
+            test -z "${asset_id}" || curl -fsS -X DELETE "${auth[@]}" \
+              "${api}/repos/${repo}/releases/${release_id}/assets/${asset_id}"
+          done < <(printf '%s' "${assets}" | jq -r '.[] | select(.name == "hkrpg.zip") | .id')
+
+          curl -fsS -X POST "${auth[@]}" \
+            -F "attachment=@hkrpg.zip;type=application/zip" \
+            "${api}/repos/${repo}/releases/${release_id}/assets?name=hkrpg.zip"
diff --git a/Cargo.toml b/Cargo.toml
index 27f0ad0..d569974 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,12 @@ resolver = "2"
 [workspace.package]
 version = "0.1.0"
 
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+strip = true
+
 [workspace.dependencies]
 windows = { version = "0.54.0", features = [
     "Win32_Foundation",
diff --git a/hkrpg/src/lib.rs b/hkrpg/src/lib.rs
index 9554897..72a3063 100644
--- a/hkrpg/src/lib.rs
+++ b/hkrpg/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(str_from_utf16_endian, once_cell_get_mut)]
+#![feature(once_cell_get_mut)]
 
 use std::{thread, time::Duration};
 
diff --git a/launcher/build.rs b/launcher/build.rs
index ce39353..2706be1 100644
--- a/launcher/build.rs
+++ b/launcher/build.rs
@@ -1,4 +1,54 @@
+use std::{env, fs, path::PathBuf, process::Command};
+
 fn main() {
-    println!("cargo:rustc-link-arg-bin=launcher=/MANIFEST:EMBED");
-    println!("cargo:rustc-link-arg-bin=launcher=/MANIFESTUAC:level=\'requireAdministrator\'");
+    match env::var("CARGO_CFG_TARGET_ENV").as_deref() {
+        Ok("msvc") => {
+            println!("cargo:rustc-link-arg-bin=launcher=/MANIFEST:EMBED");
+            println!("cargo:rustc-link-arg-bin=launcher=/MANIFESTUAC:level='requireAdministrator'");
+        }
+        Ok("gnu") => {
+            let Some(out_dir) = env::var_os("OUT_DIR") else {
+                return;
+            };
+
+            let out_dir = PathBuf::from(out_dir);
+            let manifest = out_dir.join("launcher.manifest");
+            let resource = out_dir.join("launcher.rc");
+            let object = out_dir.join("launcher-manifest.o");
+
+            if fs::write(&manifest, MANIFEST).is_err() || fs::write(&resource, RESOURCE).is_err() {
+                return;
+            }
+
+            let Ok(status) = Command::new("x86_64-w64-mingw32-windres")
+                .current_dir(&out_dir)
+                .args(["launcher.rc", "-O", "coff", "-o"])
+                .arg(&object)
+                .status()
+            else {
+                return;
+            };
+
+            if !status.success() {
+                return;
+            }
+
+            println!("cargo:rustc-link-arg-bin=launcher={}", object.display());
+        }
+        _ => {}
+    }
 }
+
+const RESOURCE: &str = "1 24 \"launcher.manifest\"\n";
+
+const MANIFEST: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+    <security>
+      <requestedPrivileges>
+        <requestedExecutionLevel level="requireAdministrator" uiAccess="false"/>
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+</assembly>
+"#;