diff --git a/tools/aapt/Bundle.h b/tools/aapt/Bundle.h
index fa84e93..a32aa7f 100644
--- a/tools/aapt/Bundle.h
+++ b/tools/aapt/Bundle.h
@@ -45,7 +45,7 @@
           mAndroidManifestFile(NULL), mPublicOutputFile(NULL),
           mRClassDir(NULL), mResourceIntermediatesDir(NULL), mManifestMinSdkVersion(NULL),
           mMinSdkVersion(NULL), mTargetSdkVersion(NULL), mMaxSdkVersion(NULL),
-          mVersionCode(NULL), mVersionName(NULL), mCustomPackage(NULL),
+          mVersionCode(NULL), mVersionName(NULL), mCustomPackage(NULL), mExtraPackages(NULL),
           mMaxResVersion(NULL), mDebugMode(false), mNonConstantId(false), mProduct(NULL),
           mArgc(0), mArgv(NULL)
         {}
@@ -138,6 +138,8 @@
     void setVersionName(const char* val) { mVersionName = val; }
     const char* getCustomPackage() const { return mCustomPackage; }
     void setCustomPackage(const char* val) { mCustomPackage = val; }
+    const char* getExtraPackages() const { return mExtraPackages; }
+    void setExtraPackages(const char* val) { mExtraPackages = val; }
     const char* getMaxResVersion() const { return mMaxResVersion; }
     void setMaxResVersion(const char * val) { mMaxResVersion = val; }
     bool getDebugMode() { return mDebugMode; }
@@ -243,6 +245,7 @@
     const char* mVersionCode;
     const char* mVersionName;
     const char* mCustomPackage;
+    const char* mExtraPackages;
     const char* mMaxResVersion;
     bool        mDebugMode;
     bool        mNonConstantId;
diff --git a/tools/aapt/Command.cpp b/tools/aapt/Command.cpp
index 739763e..c7dfb8f 100644
--- a/tools/aapt/Command.cpp
+++ b/tools/aapt/Command.cpp
@@ -1414,6 +1414,17 @@
     if (assets->getPackage() == assets->getSymbolsPrivatePackage()) {
         if (bundle->getCustomPackage() == NULL) {
             err = writeResourceSymbols(bundle, assets, assets->getPackage(), true);
+            // Copy R.java for libraries
+            if (bundle->getExtraPackages() != NULL) {
+                // Split on semicolon
+                String8 libs(bundle->getExtraPackages());
+                char* packageString = strtok(libs.lockBuffer(libs.length()), ";");
+                while (packageString != NULL) {
+                    err = writeResourceSymbols(bundle, assets, String8(packageString), true);
+                    packageString = strtok(NULL, ";");
+                }
+                libs.unlockBuffer();
+            }
         } else {
             const String8 customPkg(bundle->getCustomPackage());
             err = writeResourceSymbols(bundle, assets, customPkg, true);
diff --git a/tools/aapt/Main.cpp b/tools/aapt/Main.cpp
index 1e63131..732541d 100644
--- a/tools/aapt/Main.cpp
+++ b/tools/aapt/Main.cpp
@@ -145,6 +145,8 @@
         "       inserts android:versionName in to manifest.\n"
         "   --custom-package\n"
         "       generates R.java into a different package.\n"
+        "   --extra-packages\n"
+        "       generate R.java for libraries. Separate libraries with ';'.\n"
         "   --auto-add-overlay\n"
         "       Automatically add resources that are only in overlays.\n"
         "   --rename-manifest-package\n"
@@ -475,6 +477,15 @@
                         goto bail;
                     }
                     bundle.setCustomPackage(argv[0]);
+                } else if (strcmp(cp, "-extra-packages") == 0) {
+                    argc--;
+                    argv++;
+                    if (!argc) {
+                        fprintf(stderr, "ERROR: No argument supplied for '--extra-packages' option\n");
+                        wantUsage = true;
+                        goto bail;
+                    }
+                    bundle.setExtraPackages(argv[0]);
                 } else if (strcmp(cp, "-utf16") == 0) {
                     bundle.setWantUTF16(true);
                 } else if (strcmp(cp, "-rename-manifest-package") == 0) {