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 {