diff --git a/xtool/cppkg/cppkg.go b/xtool/cppkg/cppkg.go
index 5b401bc6..b578eb4f 100644
--- a/xtool/cppkg/cppkg.go
+++ b/xtool/cppkg/cppkg.go
@@ -29,13 +29,13 @@ const (
 // pkgAndVer: 7bitcoder/7bitconf@1.2.0
 func Install(pkgAndVer string, flags int) {
 	pkgPath, ver := parsePkgVer(pkgAndVer)
-	_, _, err := InstallPkg(pkgPath, ver, nil, flags)
+	_, _, err := InstallPkg("", pkgPath, ver, nil, flags)
 	check(err)
 }
 
 // InstallPkg installs a package with the given package path and version.
-func InstallPkg(pkgPath, ver string, options []string, flags int) (pkg *Package, buildDir string, err error) {
-	m, err := New("")
+func InstallPkg(cacheDir, pkgPath, ver string, options []string, flags int) (pkg *Package, buildDir string, err error) {
+	m, err := New(cacheDir)
 	if err != nil {
 		return
 	}