diff --git a/Android.bp b/Android.bp
index 363deca..8e6090a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,5 @@
-// This file is generated by cargo2android.py --run --dependencies --host-first-multilib.
+// This file is generated by cargo2android.py --config cargo2android.json.
+// Do not modify this file as changes will be overridden on upgrade.
 
 package {
     default_applicable_licenses: [
@@ -40,7 +41,10 @@
 
 rust_library_host {
     name: "libproc_macro_error",
+    // has rustc warnings
     crate_name: "proc_macro_error",
+    cargo_env_compat: true,
+    cargo_pkg_version: "1.0.4",
     srcs: ["src/lib.rs"],
     edition: "2018",
     features: [
@@ -48,24 +52,12 @@
         "syn",
         "syn-error",
     ],
-    flags: [
-        "--cfg skip_ui_tests",
-    ],
+    cfgs: ["use_fallback"],
     rustlibs: [
         "libproc_macro2",
         "libquote",
         "libsyn",
     ],
-    proc_macros: [
-        "libproc_macro_error_attr",
-    ],
+    proc_macros: ["libproc_macro_error_attr"],
     compile_multilib: "first",
 }
-
-// dependent_library ["feature_list"]
-//   proc-macro-error-attr-1.0.4
-//   proc-macro2-1.0.23 "default,proc-macro"
-//   quote-1.0.7 "default,proc-macro"
-//   syn-1.0.42 "clone-impls,default,derive,parsing,printing,proc-macro,quote,visit"
-//   unicode-xid-0.2.1 "default"
-//   version_check-0.9.2
diff --git a/TEST_MAPPING b/TEST_MAPPING
index d364321..8029a19 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,17 +1,18 @@
 // Generated by update_crate_tests.py for tests that depend on this crate.
 {
+  "imports": [
+    {
+      "path": "external/rust/crates/base64"
+    }
+  ],
   "presubmit": [
     {
       "name": "authfs_device_test_src_lib"
-    },
+    }
+  ],
+  "presubmit-rust": [
     {
-      "name": "base64_device_test_tests_decode"
-    },
-    {
-      "name": "base64_device_test_tests_encode"
-    },
-    {
-      "name": "base64_device_test_tests_helpers"
+      "name": "authfs_device_test_src_lib"
     }
   ]
 }
diff --git a/cargo2android.json b/cargo2android.json
new file mode 100644
index 0000000..bb77633
--- /dev/null
+++ b/cargo2android.json
@@ -0,0 +1,4 @@
+{
+  "host-first-multilib": true,
+  "run": true
+}
\ No newline at end of file