diff --git a/go.mod b/go.mod
index 41497f30..32ba8a1c 100644
--- a/go.mod
+++ b/go.mod
@@ -6,10 +6,11 @@ require (
 	github.com/gopherjs/gopherjs v0.0.0-20200217142428-fce0ec30dd00
 	github.com/goplus/gop v1.1.9
 	github.com/goplus/gox v1.12.8
+	github.com/goplus/mod v0.12.1
 	github.com/goplus/reflectx v1.2.1
 	github.com/modern-go/reflect2 v1.0.2
 	github.com/peterh/liner v1.2.2
-	github.com/qiniu/x v1.13.1
+	github.com/qiniu/x v1.13.2
 	github.com/visualfc/funcval v0.1.4
 	github.com/visualfc/gid v0.1.0
 	github.com/visualfc/goembed v0.3.2
diff --git a/go.sum b/go.sum
index e5ab00da..5b01a1ff 100644
--- a/go.sum
+++ b/go.sum
@@ -13,8 +13,9 @@ github.com/goplus/gox v1.12.1/go.mod h1:wymoQJ7ydd42cTlaXb4wNbvn4LlKjR+j8PZehI7v
 github.com/goplus/gox v1.12.8 h1:xXpsGbNIIDmykOQwI/kDcoA3cOX5ISvLPlU5RiPtyZY=
 github.com/goplus/gox v1.12.8/go.mod h1:MOJnwqA8/rSUkn0vsayHFK7TD/3XQrdexMTqdzR70X0=
 github.com/goplus/mod v0.11.5/go.mod h1:NDC5E+XOT8vcJCMjqKhLDJHTHX7lyVN4Vbfi2U7dBhs=
-github.com/goplus/mod v0.11.8 h1:90Kbg+MJhrdsonNGXYx3HUcW4IbBlRHYpIMssJaMMxM=
 github.com/goplus/mod v0.11.8/go.mod h1:yl2QncBKTdXk+8UaNsdo4u2zSpGEJYA5JKjgD3K2h00=
+github.com/goplus/mod v0.12.1 h1:4M1py5liQ/bfxPPXcmVbYn3JAjfcDpTANtih5omFI6c=
+github.com/goplus/mod v0.12.1/go.mod h1:ZtlS9wHOcAVxZ/zq7WLdKVes1HG/8Yn3KNuWZGcpeTs=
 github.com/goplus/reflectx v1.2.1 h1:y3Bq7cmP/zO++VFpZetC3zljVM3LkGivh2GgUJLu4wI=
 github.com/goplus/reflectx v1.2.1/go.mod h1:wHOS9ilbB4zrecI0W1dMmkW9JMcpXV7VjALVbNU9xfM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
@@ -28,8 +29,9 @@ github.com/peterh/liner v1.2.2/go.mod h1:xFwJyiKIXJZUKItq5dGHZSTBRAuG/CpeNpWLyiN
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/qiniu/x v1.13.0/go.mod h1:INZ2TSWSJVWO/RuELQROERcslBwVgFG7MkTfEdaQz9E=
-github.com/qiniu/x v1.13.1 h1:hi7tkXFq6BWGbBpMoLV7kvA2elop69j6Kl7TlxnFAiU=
 github.com/qiniu/x v1.13.1/go.mod h1:INZ2TSWSJVWO/RuELQROERcslBwVgFG7MkTfEdaQz9E=
+github.com/qiniu/x v1.13.2 h1:mgWOfB9Rpk6AEtlBoObZVxH+b2FHSntYrxc4KX5Ta98=
+github.com/qiniu/x v1.13.2/go.mod h1:INZ2TSWSJVWO/RuELQROERcslBwVgFG7MkTfEdaQz9E=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
diff --git a/gopbuild/build.go b/gopbuild/build.go
index d52693db..79c3edc0 100644
--- a/gopbuild/build.go
+++ b/gopbuild/build.go
@@ -26,7 +26,6 @@ import (
 	"fmt"
 	goast "go/ast"
 	"go/types"
-	"path"
 	"path/filepath"
 
 	"github.com/goplus/gop/ast"
@@ -35,6 +34,7 @@ import (
 	"github.com/goplus/gop/token"
 	"github.com/goplus/gox"
 	"github.com/goplus/igop"
+	"github.com/goplus/mod/modfile"
 
 	_ "github.com/goplus/igop/pkg/bufio"
 	_ "github.com/goplus/igop/pkg/fmt"
@@ -147,17 +147,24 @@ type Context struct {
 }
 
 func ClassKind(fname string) (isProj, ok bool) {
-	ext := path.Ext(fname)
-	if c, ok := projects[ext]; ok {
-		for _, w := range c.Works {
-			if w.Ext == ext {
-				if ext != c.Ext && fname != "main"+ext {
-					return false, true
+	ext := modfile.ClassExt(fname)
+	switch ext {
+	case ".gmx":
+		return true, true
+	case ".spx":
+		return fname == "main.spx", true
+	default:
+		if c, ok := projects[ext]; ok {
+			for _, w := range c.Works {
+				if w.Ext == ext {
+					if ext != c.Ext || fname != "main"+ext {
+						return false, true
+					}
+					break
 				}
-				break
 			}
+			return true, true
 		}
-		return true, true
 	}
 	return
 }