diff --git a/_demo/go/gobuild/demo.go b/_demo/go/gobuild/demo.go
index 70cb4700..04adfadb 100644
--- a/_demo/go/gobuild/demo.go
+++ b/_demo/go/gobuild/demo.go
@@ -1,5 +1,3 @@
-//go:build go1.23
-
 package main
 
 import (
diff --git a/runtime/internal/lib/go/build/build.go b/runtime/internal/lib/go/build/build.go
index dc778edb..dff10b62 100644
--- a/runtime/internal/lib/go/build/build.go
+++ b/runtime/internal/lib/go/build/build.go
@@ -15,8 +15,6 @@ import (
 	"strconv"
 	"strings"
 	_ "unsafe"
-
-	"github.com/goplus/llgo/runtime/internal/lib/internal/buildcfg"
 )
 
 // Type aliases to reference standard library types
@@ -63,7 +61,7 @@ func parseGoVersion() int {
 			return minor
 		}
 	}
-	return 24
+	panic("parseGoVersion: cannot parse go version from runtime.Version(): " + runtime.Version())
 }
 
 // defaultContext returns the default Context for builds.
@@ -95,7 +93,7 @@ func defaultContext() Context {
 
 	env := os.Getenv("CGO_ENABLED")
 	if env == "" {
-		env = buildcfg.DefaultCGO_ENABLED
+		env = defaultCGO_ENABLED
 	}
 	switch env {
 	case "1":
diff --git a/runtime/internal/lib/go/build/zcgo.go b/runtime/internal/lib/go/build/zcgo.go
new file mode 100644
index 00000000..34645a73
--- /dev/null
+++ b/runtime/internal/lib/go/build/zcgo.go
@@ -0,0 +1,7 @@
+// Copyright 2024 The GoPlus Authors (goplus.org). All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package build
+
+const defaultCGO_ENABLED = "1"
diff --git a/runtime/internal/lib/internal/buildcfg/buildcfg.go b/runtime/internal/lib/internal/buildcfg/buildcfg.go
deleted file mode 100644
index 88d78b00..00000000
--- a/runtime/internal/lib/internal/buildcfg/buildcfg.go
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright 2024 The GoPlus Authors (goplus.org). All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package buildcfg
-
-// llgo:skipall
-type _buildcfg struct{}
-
-// DefaultCGO_ENABLED is the default value for CGO_ENABLED
-// when the environment variable is not set.
-const DefaultCGO_ENABLED = "1"
diff --git a/runtime/internal/lib/runtime/symtab.go b/runtime/internal/lib/runtime/symtab.go
index 04d236eb..a583611f 100644
--- a/runtime/internal/lib/runtime/symtab.go
+++ b/runtime/internal/lib/runtime/symtab.go
@@ -140,6 +140,10 @@ type Func struct {
 	opaque struct{} // unexported field to disallow conversions
 }
 
+func (f *Func) Name() string {
+	panic("todo")
+}
+
 // moduledata records information about the layout of the executable
 // image. It is written by the linker. Any changes here must be
 // matched changes to the code in cmd/link/internal/ld/symtab.go:symtab.