diff --git a/.buckconfig b/.buckconfig
index fe84b7850..1718c43cd 100644
--- a/.buckconfig
+++ b/.buckconfig
@@ -1,21 +1,21 @@
 [project]
-    glob_handler = watchman
-    allow_symlinks = forbid
-    ide = intellij
-    ignore = .git, .idea, .gradle, local.properties, **/.DS_Store, **/*.iml
-    temp_files = ^#.*#$, .*~$, .*\.swp$
-    parallel_parsing = true
-    build_file_search_method = watchman
+  glob_handler = watchman
+  allow_symlinks = forbid
+  ide = intellij
+  ignore = .git, .idea, .gradle, local.properties, **/.DS_Store, **/*.iml
+  temp_files = ^#.*#$, .*~$, .*.swp$
+  parallel_parsing = true
+  build_file_search_method = watchman
 
 [httpserver]
-    port = 0
+  port = 0
 
 [intellij]
-    android_module_sdk_name = Android API 24 Platform
-    android_module_sdk_type = AndroidSDK
-    jdk_name = 1.8
-    jdk_type = JavaSDK
-    default_android_manifest_path = src/main/AndroidManifest.xml
+  android_module_sdk_name = Android API 24 Platform
+  android_module_sdk_type = AndroidSDK
+  jdk_name = 1.8
+  jdk_type = JavaSDK
+  default_android_manifest_path = src/main/AndroidManifest.xml
 
 [log]
   max_traces = 5
diff --git a/buildSrc/src/main/groovy/com/uber/okbuck/OkBuckGradlePlugin.groovy b/buildSrc/src/main/groovy/com/uber/okbuck/OkBuckGradlePlugin.groovy
index b74aabb7f..cbbcdd229 100644
--- a/buildSrc/src/main/groovy/com/uber/okbuck/OkBuckGradlePlugin.groovy
+++ b/buildSrc/src/main/groovy/com/uber/okbuck/OkBuckGradlePlugin.groovy
@@ -163,6 +163,7 @@ class OkBuckGradlePlugin implements Plugin<Project> {
                 if (hasGroovyLib) {
                     GroovyUtil.setupGroovyHome(project)
                 }
+
                 generate(project,
                         okbuckExt,
                         hasGroovyLib ? GroovyUtil.GROOVY_HOME_LOCATION : null)
@@ -180,12 +181,20 @@ class OkBuckGradlePlugin implements Plugin<Project> {
             dotBuckConfig.createNewFile()
         }
 
+        // Setup defs
+        FileUtil.copyResourceToProject("defs/OKBUCK_DEFS", project.file(OKBUCK_DEFS))
+        Set<String> defs = okbuckExt.extraDefs.collect {
+            "//${FileUtil.getRelativePath(project.rootDir, it)}"
+        }
+        defs.add("//${OKBUCK_DEFS}")
+
         // generate .buckconfig.local
         File dotBuckConfigLocal = project.file(".buckconfig.local")
-        FileUtil.copyResourceToProject("defs/OKBUCK_DEFS", project.file(OKBUCK_DEFS))
         PrintStream configPrinter = new PrintStream(dotBuckConfigLocal)
-        DotBuckConfigLocalGenerator.generate(okbuckExt, groovyHome,
-                ProguardUtil.getProguardJarPath(project)).print(configPrinter)
+        DotBuckConfigLocalGenerator.generate(okbuckExt,
+                groovyHome,
+                ProguardUtil.getProguardJarPath(project),
+                defs).print(configPrinter)
         IOUtils.closeQuietly(configPrinter)
     }
 
diff --git a/buildSrc/src/main/groovy/com/uber/okbuck/config/DotBuckConfigLocalFile.java b/buildSrc/src/main/groovy/com/uber/okbuck/config/DotBuckConfigLocalFile.java
index e70b5a97e..e7d96055b 100644
--- a/buildSrc/src/main/groovy/com/uber/okbuck/config/DotBuckConfigLocalFile.java
+++ b/buildSrc/src/main/groovy/com/uber/okbuck/config/DotBuckConfigLocalFile.java
@@ -1,12 +1,11 @@
 package com.uber.okbuck.config;
 
-import com.uber.okbuck.OkBuckGradlePlugin;
-
 import org.apache.commons.lang.StringUtils;
 
 import java.io.PrintStream;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 public final class DotBuckConfigLocalFile extends BuckConfigFile {
 
@@ -16,6 +15,7 @@ public final class DotBuckConfigLocalFile extends BuckConfigFile {
     private final List<String> ignore;
     private final String groovyHome;
     private final String proguardJar;
+    private final Set<String> defs;
 
     public DotBuckConfigLocalFile(
             Map<String, String> aliases,
@@ -23,13 +23,15 @@ public DotBuckConfigLocalFile(
             String target,
             List<String> ignore,
             String groovyHome,
-            String proguardJar) {
+            String proguardJar,
+            Set<String> defs) {
         this.aliases = aliases;
         this.buildToolVersion = buildToolVersion;
         this.target = target;
         this.ignore = ignore;
         this.groovyHome = groovyHome;
         this.proguardJar = proguardJar;
+        this.defs = defs;
     }
 
     @Override
@@ -44,12 +46,14 @@ public final void print(PrintStream printer) {
         printer.println();
 
         printer.println("[project]");
-        printer.print("\tignore = " + String.join(",", ignore));
+        printer.print("\tignore = " + String.join(", ", ignore));
         printer.println();
 
-        printer.println("[buildfile]");
-        printer.print("\tincludes = //" + OkBuckGradlePlugin.OKBUCK_DEFS);
-        printer.println();
+        if (!defs.isEmpty()) {
+            printer.println("[buildfile]");
+            printer.print("\tincludes = " + String.join(" ", defs));
+            printer.println();
+        }
 
         if (!StringUtils.isEmpty(groovyHome)) {
             printer.println("[groovy]");
diff --git a/buildSrc/src/main/groovy/com/uber/okbuck/generator/BuckFileGenerator.groovy b/buildSrc/src/main/groovy/com/uber/okbuck/generator/BuckFileGenerator.groovy
index 6cb9c29a8..a5a8ef653 100644
--- a/buildSrc/src/main/groovy/com/uber/okbuck/generator/BuckFileGenerator.groovy
+++ b/buildSrc/src/main/groovy/com/uber/okbuck/generator/BuckFileGenerator.groovy
@@ -41,7 +41,6 @@ import com.uber.okbuck.rule.android.ExopackageAndroidLibraryRule
 import com.uber.okbuck.rule.android.GenAidlRule
 import com.uber.okbuck.rule.base.BuckRule
 import com.uber.okbuck.rule.base.GenRule
-import com.uber.okbuck.rule.java.JavaLibraryWrapperRule
 import org.apache.commons.io.IOUtils
 import org.gradle.api.Project
 
diff --git a/buildSrc/src/main/groovy/com/uber/okbuck/generator/DotBuckConfigLocalGenerator.groovy b/buildSrc/src/main/groovy/com/uber/okbuck/generator/DotBuckConfigLocalGenerator.groovy
index aa8c76bc4..825d9de6e 100644
--- a/buildSrc/src/main/groovy/com/uber/okbuck/generator/DotBuckConfigLocalGenerator.groovy
+++ b/buildSrc/src/main/groovy/com/uber/okbuck/generator/DotBuckConfigLocalGenerator.groovy
@@ -16,7 +16,10 @@ final class DotBuckConfigLocalGenerator {
     /**
      * generate {@link DotBuckConfigLocalFile}
      */
-    static DotBuckConfigLocalFile generate(OkBuckExtension okbuck, String groovyHome, String proguardJar) {
+    static DotBuckConfigLocalFile generate(OkBuckExtension okbuck,
+                                           String groovyHome,
+                                           String proguardJar,
+                                           Set<String> defs) {
         Map<String, String> aliases = [:]
         okbuck.buckProjects.findAll { Project project ->
             ProjectUtil.getType(project) == ProjectType.ANDROID_APP
@@ -32,6 +35,7 @@ final class DotBuckConfigLocalGenerator {
                 okbuck.target,
                 [".git", "**/.svn"],
                 groovyHome,
-                proguardJar)
+                proguardJar,
+                defs)
     }
 }
diff --git a/buildSrc/src/main/groovy/com/uber/okbuck/rule/android/AndroidRule.groovy b/buildSrc/src/main/groovy/com/uber/okbuck/rule/android/AndroidRule.groovy
index 147f571d3..453de3a7c 100644
--- a/buildSrc/src/main/groovy/com/uber/okbuck/rule/android/AndroidRule.groovy
+++ b/buildSrc/src/main/groovy/com/uber/okbuck/rule/android/AndroidRule.groovy
@@ -120,14 +120,14 @@ abstract class AndroidRule extends BuckRule {
                 printer.println("\t\t'${processor}',")
             }
             printer.println("\t],")
-        }
 
-        if (!mAptDeps.empty) {
-            printer.println("\tannotation_processor_deps = [")
-            for (String dep : mAptDeps.sort()) {
-                printer.println("\t\t'${dep}',")
+            if (!mAptDeps.empty) {
+                printer.println("\tannotation_processor_deps = [")
+                for (String dep : mAptDeps.sort()) {
+                    printer.println("\t\t'${dep}',")
+                }
+                printer.println("\t],")
             }
-            printer.println("\t],")
         }
 
         if (!mProvidedDeps.empty) {
diff --git a/buildSrc/src/main/java/com/uber/okbuck/extension/OkBuckExtension.java b/buildSrc/src/main/java/com/uber/okbuck/extension/OkBuckExtension.java
index e552ca093..75749b10a 100644
--- a/buildSrc/src/main/java/com/uber/okbuck/extension/OkBuckExtension.java
+++ b/buildSrc/src/main/java/com/uber/okbuck/extension/OkBuckExtension.java
@@ -2,7 +2,9 @@
 
 import org.gradle.api.Project;
 
+import java.io.File;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -56,6 +58,9 @@ public class OkBuckExtension {
      */
     public Map<String, Map<String, List<String>>> extraBuckOpts = new HashMap<>();
 
+    /** Extra buck defs **/
+    public Set<File> extraDefs = new HashSet<>();
+
     /**
      * Whether to turn on buck's resource_union to reflect gradle's resource merging behavior
      */