diff --git a/x/nm/index.go b/x/nm/index.go
index 4f6f859b..f5af7f50 100644
--- a/x/nm/index.go
+++ b/x/nm/index.go
@@ -61,7 +61,7 @@ func (p *IndexBuilder) IndexDir(fromDir, toDir string, progress func(path string
 		}
 		fname := d.Name()
 		switch filepath.Ext(fname) {
-		case ".a", ".dylib", ".so", ".dll", ".lib":
+		case ".a", ".dylib", ".tbd", ".so", ".dll", ".lib":
 			progress(path)
 			hash := md5.Sum([]byte(path))
 			hashStr := base64.RawURLEncoding.EncodeToString(hash[:])
diff --git a/x/nm/nm.go b/x/nm/nm.go
index 90f0b4b1..6a909c2b 100644
--- a/x/nm/nm.go
+++ b/x/nm/nm.go
@@ -79,15 +79,33 @@ type ObjectFile struct {
 // List lists symbols in an archive file.
 func (p *Cmd) List(arfile string) (items []*ObjectFile, err error) {
 	var stdout bytes.Buffer
+	var stderr bytes.Buffer
 	cmd := exec.Command(p.app, arfile)
 	cmd.Stdout = &stdout
-	cmd.Stderr = os.Stderr
-	if err = cmd.Run(); err != nil {
+	cmd.Stderr = &stderr
+	err = cmd.Run()
+	if stderr.Len() > 0 {
+		listError(stderr.Bytes())
+	}
+	if err != nil {
 		return
 	}
 	return listOutput(stdout.Bytes())
 }
 
+func listError(data []byte) {
+	sep := []byte{'\n'}
+	nosym := []byte(": no symbols")
+	lines := bytes.Split(data, sep)
+	for _, line := range lines {
+		if len(line) == 0 || bytes.HasSuffix(line, nosym) {
+			continue
+		}
+		os.Stderr.Write(line)
+		os.Stderr.Write(sep)
+	}
+}
+
 func listOutput(data []byte) (items []*ObjectFile, err error) {
 	sep := []byte{'\n'}
 	item := &ObjectFile{}