diff --git a/examples/python-basic/build.envd b/examples/python-basic/build.envd
new file mode 100644
index 000000000..3937935f2
--- /dev/null
+++ b/examples/python-basic/build.envd
@@ -0,0 +1,6 @@
+def build():
+    base(os="ubuntu20.04", language="python3")
+    #config.pip_index(url = "https://pypi.tuna.tsinghua.edu.cn/simple")
+    install.python_packages([
+        "via",
+    ])
diff --git a/pkg/builder/build.go b/pkg/builder/build.go
index 6e87f6efd..e9390c9fe 100644
--- a/pkg/builder/build.go
+++ b/pkg/builder/build.go
@@ -18,6 +18,7 @@ import (
 	"context"
 
 	"github.com/cockroachdb/errors"
+	"github.com/moby/buildkit/exporter/containerimage/exptypes"
 	"github.com/moby/buildkit/frontend/gateway/client"
 )
 
@@ -28,6 +29,11 @@ func (b generalBuilder) BuildFunc() func(ctx context.Context, c client.Client) (
 			return nil, errors.Wrap(err, "failed to compile")
 		}
 
+		imageConfig, err := b.imageConfig(ctx)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to get labels")
+		}
+
 		sreq := client.SolveRequest{
 			Definition: def.ToPB(),
 		}
@@ -43,6 +49,8 @@ func (b generalBuilder) BuildFunc() func(ctx context.Context, c client.Client) (
 			return nil, err
 		}
 
+		res.AddMeta(exptypes.ExporterImageConfigKey, []byte(imageConfig))
+
 		return res, nil
 	}
 }
diff --git a/pkg/builder/builder.go b/pkg/builder/builder.go
index 239c19e30..6a7541406 100644
--- a/pkg/builder/builder.go
+++ b/pkg/builder/builder.go
@@ -190,11 +190,6 @@ func (b generalBuilder) imageConfig(ctx context.Context) (string, error) {
 }
 
 func (b generalBuilder) build(ctx context.Context, pw progresswriter.Writer) error {
-	imageConfig, err := b.imageConfig(ctx)
-	if err != nil {
-		return errors.Wrap(err, "failed to get labels")
-	}
-
 	ce, err := ParseExportCache([]string{b.ExportCache}, nil)
 	if err != nil {
 		return errors.Wrap(err, "failed to parse export cache")
@@ -222,8 +217,6 @@ func (b generalBuilder) build(ctx context.Context, pw progresswriter.Writer) err
 						Type: client.ExporterDocker,
 						Attrs: map[string]string{
 							"name": b.Tag,
-							// Ref https://github.com/r2d4/mockerfile/blob/140c6a912bbfdae220febe59ab535ef0acba0e1f/pkg/build/build.go#L65
-							"containerimage.config": imageConfig,
 						},
 						Output: func(map[string]string) (io.WriteCloser, error) {
 							return pipeW, nil