diff --git a/build.sh b/build.sh
index c537a2a..1b4c34f 100644
--- a/build.sh
+++ b/build.sh
@@ -14,12 +14,15 @@ TARGET_DIR="${SCRIPT_DIR}/build"
 case "$(uname -s)" in
 Linux*)
   PLATFORM="linux"
+  LIB_EXT="so"
   ;;
 Darwin*)
   PLATFORM="darwin"
+  LIB_EXT="dylib"
   ;;
 CYGWIN* | MINGW* | MSYS*)
   PLATFORM="windows"
+  LIB_EXT="dll"
   ;;
 *)
   echo "Unsupported platform"
@@ -62,20 +65,30 @@ test_gh_auth() {
   fi
 }
 
+fetch_remote_tags() {
+  git ls-remote --tags origin | cut -f2 | sed 's|refs/tags/||' | while read tag; do
+    if ! git rev-parse "$tag" >/dev/null 2>&1; then
+      git fetch origin "refs/tags/$tag:refs/tags/$tag"
+    fi
+  done
+}
+
 if [ ! -d "$TARGET_DIR" ]; then
   mkdir -p "$TARGET_DIR"
 fi
 
+fetch_remote_tags
 latest_tag="$(git describe --tags --abbrev=0 || true)" # will be empty in clone repos
 built_tag="$(cat build/.tag 2>/dev/null || true)"
 
 save_tag() {
-  echo "$latest_tag" >build/.tag
+  echo "$latest_tag" > build/.tag
 }
 
 if [[ "$latest_tag" = "$built_tag" && -n "$latest_tag" ]]; then
-  echo "Local build is up to date. No download needed."
+  echo "Local build is up to date $latest_tag. No download needed."
 elif [[ "$latest_tag" != "$built_tag" && -n "$latest_tag" ]]; then
+  echo "Local build is out of date $built_tag. Downloading latest $latest_tag."
   if test_command "gh" && test_gh_auth; then
     gh release download "$latest_tag" --repo "github.com/$REPO_OWNER/$REPO_NAME" --pattern "*$ARTIFACT_NAME_PATTERN*" --clobber --output - | tar -zxv -C "$TARGET_DIR"
     save_tag
@@ -91,8 +104,9 @@ elif [[ "$latest_tag" != "$built_tag" && -n "$latest_tag" ]]; then
     save_tag
   fi
 else
+  echo "No latest tag found. Building from source."
   cargo build --release --features=$LUA_VERSION
-  for f in target/release/lib*.so; do
+  for f in target/release/lib*.$LIB_EXT; do
     cp "$f" "build/$(echo $f | sed 's#.*/lib##')"
   done
 fi