diff --git a/internal/lib/math/math.go b/internal/lib/math/math.go
index 588cbae5..be6f1c8d 100644
--- a/internal/lib/math/math.go
+++ b/internal/lib/math/math.go
@@ -22,6 +22,10 @@ import (
 	"github.com/goplus/llgo/c"
 )
 
+const (
+	LLGoPackage = true
+)
+
 //go:linkname Acos C.acos
 func Acos(x float64) float64
 
diff --git a/ssa/decl.go b/ssa/decl.go
index caffa5fe..9e4a6ca6 100644
--- a/ssa/decl.go
+++ b/ssa/decl.go
@@ -26,13 +26,6 @@ import (
 
 // -----------------------------------------------------------------------------
 
-const (
-	ClosureCtx  = "__llgo_ctx"
-	ClosureStub = "__llgo_stub."
-)
-
-// -----------------------------------------------------------------------------
-
 const (
 	NameValist = "__llgo_va_list"
 )
diff --git a/ssa/package.go b/ssa/package.go
index 9ef00f79..2a04994f 100644
--- a/ssa/package.go
+++ b/ssa/package.go
@@ -564,6 +564,11 @@ func (p Package) cFunc(fullName string, sig *types.Signature) Expr {
 	return p.NewFunc(fullName, sig, InC).Expr
 }
 
+const (
+	closureCtx  = "__llgo_ctx"
+	closureStub = "__llgo_stub."
+)
+
 func (p Package) closureStub(b Builder, t *types.Struct, v Expr) Expr {
 	name := v.impl.Name()
 	prog := b.Prog
@@ -574,9 +579,9 @@ func (p Package) closureStub(b Builder, t *types.Struct, v Expr) Expr {
 		sig := v.raw.Type.(*types.Signature)
 		n := sig.Params().Len()
 		nret := sig.Results().Len()
-		ctx := types.NewParam(token.NoPos, nil, ClosureCtx, types.Typ[types.UnsafePointer])
+		ctx := types.NewParam(token.NoPos, nil, closureCtx, types.Typ[types.UnsafePointer])
 		sig = FuncAddCtx(ctx, sig)
-		fn := p.NewFunc(ClosureStub+name, sig, InC)
+		fn := p.NewFunc(closureStub+name, sig, InC)
 		fn.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 		args := make([]Expr, n)
 		for i := 0; i < n; i++ {
diff --git a/ssa/type_cvt.go b/ssa/type_cvt.go
index a9314a68..299a0970 100644
--- a/ssa/type_cvt.go
+++ b/ssa/type_cvt.go
@@ -133,7 +133,7 @@ func (p goTypes) cvtNamed(t *types.Named) (raw *types.Named, cvt bool) {
 }
 
 func (p goTypes) cvtClosure(sig *types.Signature) *types.Struct {
-	ctx := types.NewParam(token.NoPos, nil, ClosureCtx, types.Typ[types.UnsafePointer])
+	ctx := types.NewParam(token.NoPos, nil, closureCtx, types.Typ[types.UnsafePointer])
 	raw := p.cvtFunc(sig, ctx)
 	flds := []*types.Var{
 		types.NewField(token.NoPos, nil, "f", raw, false),