diff --git a/README.md b/README.md
index c932007..d2b84da 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ If a session drops, use the **Reconnect** button in the disconnected overlay.
 - Product overview: [docs/overview.md](docs/overview.md)
 - Quick start (shareable): [docs/quick-start.md](docs/quick-start.md)
 - User manual: [docs/user-manual.md](docs/user-manual.md)
+- Build and release: [docs/build-and-release.md](docs/build-and-release.md)
 
 ## Keyboard shortcuts
 
diff --git a/build-all.sh b/build-all.sh
index e52d7b0..875900a 100755
--- a/build-all.sh
+++ b/build-all.sh
@@ -16,6 +16,14 @@ log()  { echo -e "${GREEN}[nexus]${NC} $1"; }
 warn() { echo -e "${YELLOW}[nexus]${NC} $1"; }
 err()  { echo -e "${RED}[nexus]${NC} $1" >&2; }
 
+build_tags() {
+    if command -v pkg-config >/dev/null 2>&1 \
+        && pkg-config --exists webkit2gtk-4.1 \
+        && ! pkg-config --exists webkit2gtk-4.0; then
+        echo "webkit2_41"
+    fi
+}
+
 build_version() {
     local tag
     local commit
@@ -100,6 +108,8 @@ build_target() {
     local version="$4"
     local ldflags
     ldflags="$(build_ldflags "${version}")"
+    local tags
+    tags="$(build_tags)"
 
     local platform="${target_os}/${target_arch}"
     local cc=""
@@ -114,9 +124,17 @@ build_target() {
 
     log "Building ${platform}…"
     if [ -n "$cc" ]; then
-        CC="$cc" CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags"
+        if [ -n "$tags" ]; then
+            CC="$cc" CGO_ENABLED=1 wails build -platform "$platform" -tags "$tags" -ldflags "$ldflags"
+        else
+            CC="$cc" CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags"
+        fi
     else
-        CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags"
+        if [ -n "$tags" ]; then
+            CGO_ENABLED=1 wails build -platform "$platform" -tags "$tags" -ldflags "$ldflags"
+        else
+            CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags"
+        fi
     fi
 }
 
diff --git a/build.sh b/build.sh
index c394099..6e51bd0 100755
--- a/build.sh
+++ b/build.sh
@@ -17,6 +17,14 @@ log()  { echo -e "${GREEN}[nexus]${NC} $1"; }
 warn() { echo -e "${YELLOW}[nexus]${NC} $1"; }
 err()  { echo -e "${RED}[nexus]${NC} $1" >&2; }
 
+build_tags() {
+    if command -v pkg-config >/dev/null 2>&1 \
+        && pkg-config --exists webkit2gtk-4.1 \
+        && ! pkg-config --exists webkit2gtk-4.0; then
+        echo "webkit2_41"
+    fi
+}
+
 build_version() {
     local tag
     local commit
@@ -81,7 +89,14 @@ build() {
     log "Building production binary…"
     local version
     version="$(build_version)"
-    wails build -ldflags "$(build_ldflags "${version}")"
+    local tags
+    tags="$(build_tags)"
+    if [ -n "$tags" ]; then
+        log "Using Wails build tags: ${tags}"
+        wails build -tags "$tags" -ldflags "$(build_ldflags "${version}")"
+    else
+        wails build -ldflags "$(build_ldflags "${version}")"
+    fi
     log "Build complete: build/bin/"
 }
 
diff --git a/docs/build-and-release.md b/docs/build-and-release.md
new file mode 100644
index 0000000..71add66
--- /dev/null
+++ b/docs/build-and-release.md
@@ -0,0 +1,77 @@
+# Build and Release
+
+This project uses [Wails](https://wails.io/) for desktop packaging.
+
+## Ubuntu 24.04 prerequisites
+
+Install the Linux build toolchain and Wails runtime headers with:
+
+```bash
+sudo apt-get update
+sudo apt-get install -y \
+  build-essential \
+  libgtk-3-dev \
+  libwebkit2gtk-4.1-dev \
+  libayatana-appindicator3-dev \
+  pkg-config \
+  zip
+```
+
+Notes:
+
+- Ubuntu 24.04 does not ship `libwebkit2gtk-4.0-dev`.
+- Wails `v2.12.0` supports Ubuntu 24.04 by building with the `webkit2_41` tag.
+- The local build scripts detect that package layout automatically and add the tag when needed.
+
+You will also need these tools available in `PATH`:
+
+- `go`
+- `node`
+- `npm`
+- `wails`
+
+Install the Wails CLI with:
+
+```bash
+go install github.com/wailsapp/wails/v2/cmd/wails@latest
+export PATH="$PATH:$(go env GOPATH)/bin"
+```
+
+## Build commands
+
+Build the app binary for the current host:
+
+```bash
+./build.sh
+```
+
+Build a packaged release for the current host platform:
+
+```bash
+./release.sh
+```
+
+By default, `./release.sh` now builds only the current host OS/architecture. On this Ubuntu 24.04 `amd64` host that means `linux/amd64`.
+
+## Optional cross-compilers
+
+If you want to add extra Linux/Windows targets from Ubuntu, install the relevant cross-compiler packages first:
+
+```bash
+sudo apt-get install -y \
+  gcc-aarch64-linux-gnu \
+  gcc-mingw-w64-x86-64
+```
+
+Then request explicit targets:
+
+```bash
+NEXUS_RELEASE_TARGETS=linux/amd64,windows/amd64 ./release.sh
+```
+
+## Platform caveats
+
+- macOS targets cannot be cross-built from Linux with Wails. Build those on macOS.
+- `windows/arm64` is not covered by the default Ubuntu toolchain here.
+- `linux/arm64` needs more than `gcc-aarch64-linux-gnu`; it also needs an `arm64` sysroot and target GTK/WebKit development libraries for CGO to link cleanly.
+- Tested on Ubuntu 24.04 `amd64`: `linux/amd64` and `windows/amd64` build successfully; `linux/arm64` does not in the default host setup above.
diff --git a/release.sh b/release.sh
index 98612c7..a301442 100755
--- a/release.sh
+++ b/release.sh
@@ -18,6 +18,53 @@ log()  { echo -e "${GREEN}[nexus]${NC} $1"; }
 warn() { echo -e "${YELLOW}[nexus]${NC} $1"; }
 err()  { echo -e "${RED}[nexus]${NC} $1" >&2; }
 
+host_os() {
+    case "$(uname -s)" in
+        Darwin) echo "darwin" ;;
+        Linux) echo "linux" ;;
+        *) echo "unknown" ;;
+    esac
+}
+
+host_arch() {
+    case "$(uname -m)" in
+        x86_64|amd64) echo "amd64" ;;
+        arm64|aarch64) echo "arm64" ;;
+        *) echo "unknown" ;;
+    esac
+}
+
+build_tags() {
+    if command -v pkg-config >/dev/null 2>&1 \
+        && pkg-config --exists webkit2gtk-4.1 \
+        && ! pkg-config --exists webkit2gtk-4.0; then
+        echo "webkit2_41"
+    fi
+}
+
+default_targets() {
+    local os
+    local arch
+    os="$(host_os)"
+    arch="$(host_arch)"
+
+    if [ "$os" = "unknown" ] || [ "$arch" = "unknown" ]; then
+        err "Unsupported host platform: $(uname -s)/$(uname -m)"
+        exit 1
+    fi
+
+    echo "${os}/${arch}"
+}
+
+release_targets() {
+    if [ -n "${NEXUS_RELEASE_TARGETS:-}" ]; then
+        echo "$NEXUS_RELEASE_TARGETS" | tr ',' '\n' | sed '/^[[:space:]]*$/d'
+        return
+    fi
+
+    default_targets
+}
+
 check_deps() {
     command -v go >/dev/null 2>&1 || { err "Go is not installed"; exit 1; }
     command -v node >/dev/null 2>&1 || { err "Node.js is not installed"; exit 1; }
@@ -132,6 +179,8 @@ build_target() {
     log "Building ${platform}..."
     local ldflags
     ldflags="$(build_ldflags "$version")"
+    local tags
+    tags="$(build_tags)"
     if [ -n "$cc" ]; then
         local cc_cmd="$cc"
         if [ -n "$zig_target" ]; then
@@ -141,12 +190,22 @@ build_target() {
                 cc_cmd="zig cc -target ${zig_target}-windows-gnu"
             fi
         fi
-        if ! CC="$cc_cmd" CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags" -o "$output_path"; then
+        if [ -n "$tags" ]; then
+            if ! CC="$cc_cmd" CGO_ENABLED=1 wails build -platform "$platform" -tags "$tags" -ldflags "$ldflags" -o "$output_path"; then
+                warn "Build failed for ${platform}"
+                return 1
+            fi
+        elif ! CC="$cc_cmd" CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags" -o "$output_path"; then
             warn "Build failed for ${platform}"
             return 1
         fi
     else
-        if ! CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags" -o "$output_path"; then
+        if [ -n "$tags" ]; then
+            if ! CGO_ENABLED=1 wails build -platform "$platform" -tags "$tags" -ldflags "$ldflags" -o "$output_path"; then
+                warn "Build failed for ${platform}"
+                return 1
+            fi
+        elif ! CGO_ENABLED=1 wails build -platform "$platform" -ldflags "$ldflags" -o "$output_path"; then
             warn "Build failed for ${platform}"
             return 1
         fi
@@ -273,13 +332,27 @@ main() {
     log "Building release ${version}..."
     : > "${out_dir}/.release-files"
 
+    local targets
+    mapfile -t targets < <(release_targets)
+    if [ "${#targets[@]}" -eq 0 ]; then
+        err "No release targets selected."
+        exit 1
+    fi
+
     local errors=0
-    if ! build_target "darwin" "amd64" "$version" "$out_dir"; then errors=1; fi
-    if ! build_target "darwin" "arm64" "$version" "$out_dir"; then errors=1; fi
-    if ! build_target "linux" "amd64" "$version" "$out_dir"; then errors=1; fi
-    if ! build_target "linux" "arm64" "$version" "$out_dir"; then errors=1; fi
-    if ! build_target "windows" "amd64" "$version" "$out_dir"; then errors=1; fi
-    if ! build_target "windows" "arm64" "$version" "$out_dir"; then errors=1; fi
+    local target
+    for target in "${targets[@]}"; do
+        local target_os="${target%%/*}"
+        local target_arch="${target##*/}"
+        if [ "$target_os" = "$target_arch" ] || [ -z "$target_os" ] || [ -z "$target_arch" ]; then
+            err "Invalid release target: ${target}"
+            errors=1
+            continue
+        fi
+        if ! build_target "$target_os" "$target_arch" "$version" "$out_dir"; then
+            errors=1
+        fi
+    done
 
     write_manifest "$version" "$out_dir" "$release_root"