diff --git a/.github/workflows/llgo.yml b/.github/workflows/llgo.yml
index d111f67b..08fe6249 100644
--- a/.github/workflows/llgo.yml
+++ b/.github/workflows/llgo.yml
@@ -10,7 +10,23 @@ on:
     branches: [ "**" ]
 
 jobs:
+  download-model:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download model file
+        run: |
+          mkdir -p ./_demo/llama2-c
+          wget -P ./_demo/llama2-c https://huggingface.co/karpathy/tinyllamas/resolve/main/stories15M.bin
+
+      - name: Upload model as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: llama2-model
+          path: ./_demo/llama2-c/stories15M.bin
+          retention-days: 1
+
   llgo:
+    needs: download-model
     continue-on-error: true
     strategy:
       matrix:
@@ -26,9 +42,13 @@ jobs:
         uses: ./.github/actions/setup-deps
         with:
           llvm-version: ${{matrix.llvm}}
+      - name: Download model artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: llama2-model
+          path: ./_demo/llama2-c/
       - name: Install further optional dependencies for demos
         run: |
-          wget -P ./_demo/llama2-c https://huggingface.co/karpathy/tinyllamas/resolve/main/stories15M.bin
           py_deps=(
             numpy # for github.com/goplus/llgo/py/numpy
             torch # for github.com/goplus/llgo/py/torch
@@ -112,7 +132,6 @@ jobs:
           llvm-version: ${{matrix.llvm}}
       - name: Install further optional dependencies for demos
         run: |
-          wget -P ./_demo/llama2-c https://huggingface.co/karpathy/tinyllamas/resolve/main/stories15M.bin
           py_deps=(
             numpy # for github.com/goplus/llgo/py/numpy
             torch # for github.com/goplus/llgo/py/torch
diff --git a/c/debug/_wrap/debug.c b/c/debug/_wrap/debug.c
index 4b11a191..32d87903 100644
--- a/c/debug/_wrap/debug.c
+++ b/c/debug/_wrap/debug.c
@@ -1,6 +1,8 @@
 #if defined(__linux__)
 #define UNW_LOCAL_ONLY
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <features.h>
 #endif
 
diff --git a/c/debug/debug.go b/c/debug/debug.go
index 16e00eea..76260b0d 100644
--- a/c/debug/debug.go
+++ b/c/debug/debug.go
@@ -11,8 +11,8 @@ import (
 )
 
 const (
-	LLGoPackage = "link"
-	LLGoFiles   = "_wrap/debug.c"
+	LLGoPackage = "link: $(llvm-config --ldflags --libs); -lunwind"
+	LLGoFiles   = "$(llvm-config --cflags): _wrap/debug.c"
 )
 
 type Info struct {
diff --git a/runtime/internal/clite/debug/_wrap/debug.c b/runtime/internal/clite/debug/_wrap/debug.c
index 4b11a191..32d87903 100644
--- a/runtime/internal/clite/debug/_wrap/debug.c
+++ b/runtime/internal/clite/debug/_wrap/debug.c
@@ -1,6 +1,8 @@
 #if defined(__linux__)
 #define UNW_LOCAL_ONLY
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <features.h>
 #endif
 
diff --git a/runtime/internal/clite/debug/debug.go b/runtime/internal/clite/debug/debug.go
index 10e3a41e..48a27649 100644
--- a/runtime/internal/clite/debug/debug.go
+++ b/runtime/internal/clite/debug/debug.go
@@ -11,8 +11,8 @@ import (
 )
 
 const (
-	LLGoPackage = "link"
-	LLGoFiles   = "_wrap/debug.c"
+	LLGoPackage = "link: $(llvm-config --ldflags --libs); -lunwind"
+	LLGoFiles   = "$(llvm-config --cflags): _wrap/debug.c"
 )
 
 type Info struct {