diff --git a/app/build.gradle b/app/build.gradle
index a7350f429..d7350c5d1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -5,13 +5,8 @@ def configPath = project.hasProperty('configPath') ? project.configPath : rootPr
 configProps.load(new FileInputStream(configPath))
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
-
     defaultConfig {
-        minSdkVersion 17
         applicationId "com.topjohnwu.magisk"
-        targetSdkVersion rootProject.ext.compileSdkVersion
         vectorDrawables.useSupportLibrary = true
     }
 
@@ -56,14 +51,6 @@ android {
         }
     }
 
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-    dexOptions {
-        preDexLibraries true
-        javaMaxHeapSize "2g"
-    }
     lintOptions {
         disable 'MissingTranslation'
     }
@@ -71,19 +58,21 @@ android {
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    implementation 'androidx.core:core:1.0.1'
     implementation project(':net')
     fullImplementation project(':core')
+    fullImplementation 'ru.noties:markwon:2.0.1'
+    fullImplementation 'com.caverock:androidsvg-aar:1.3'
+
+    def androidXVersion = "1.0.0"
+    implementation 'androidx.core:core:1.0.1'
     fullImplementation 'androidx.appcompat:appcompat:1.0.2'
-    fullImplementation "androidx.preference:preference:${rootProject.ext.androidXVersion}"
-    fullImplementation "androidx.recyclerview:recyclerview:${rootProject.ext.androidXVersion}"
-    fullImplementation "androidx.cardview:cardview:${rootProject.ext.androidXVersion}"
-    fullImplementation "com.google.android.material:material:${rootProject.ext.androidXVersion}"
+    fullImplementation "androidx.preference:preference:${androidXVersion}"
+    fullImplementation "androidx.recyclerview:recyclerview:${androidXVersion}"
+    fullImplementation "androidx.cardview:cardview:${androidXVersion}"
+    fullImplementation "com.google.android.material:material:${androidXVersion}"
     fullImplementation 'android.arch.work:work-runtime:1.0.0-beta01'
     fullImplementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
     fullImplementation 'androidx.room:room-runtime:2.0.0'
-    fullImplementation 'ru.noties:markwon:2.0.1'
-    fullImplementation 'com.caverock:androidsvg-aar:1.3'
 
     def butterKnifeVersion = '10.0.0'
     if (properties.containsKey('android.injected.invoked.from.ide')) {
diff --git a/build.gradle b/build.gradle
index cf1700675..6940a1964 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,20 +15,34 @@ buildscript {
     }
 }
 
-allprojects {
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
+
+subprojects {
     repositories {
         google()
         jcenter()
         maven { url "https://jitpack.io" }
     }
-}
+    afterEvaluate {
+        if (getPlugins().hasPlugin('com.android.library') ||
+            getPlugins().hasPlugin('com.android.application')) {
+            android {
+                compileSdkVersion 28
+                buildToolsVersion "28.0.3"
 
-ext {
-    compileSdkVersion = 28
-    buildToolsVersion = "28.0.3"
-    androidXVersion = "1.0.0"
-}
+                defaultConfig {
+                    if (minSdkVersion == null)
+                        minSdkVersion 17
+                    targetSdkVersion 28
+                }
 
-task clean(type: Delete) {
-    delete rootProject.buildDir
+                compileOptions {
+                    sourceCompatibility JavaVersion.VERSION_1_8
+                    targetCompatibility JavaVersion.VERSION_1_8
+                }
+            }
+        }
+    }
 }
diff --git a/core/build.gradle b/core/build.gradle
index 43a1c182c..e640219b4 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -1,21 +1,6 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
-
-    defaultConfig {
-        minSdkVersion 17
-        targetSdkVersion rootProject.ext.compileSdkVersion
-        versionCode 1
-        versionName "1.0"
-    }
-
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-
     buildTypes {
         release {
             minifyEnabled false
diff --git a/native/build.gradle b/native/build.gradle
index 1bc8cafa4..146637410 100644
--- a/native/build.gradle
+++ b/native/build.gradle
@@ -1,8 +1,6 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     externalNativeBuild {
         ndkBuild {
diff --git a/net/build.gradle b/net/build.gradle
index f754ca5be..b16ee12fb 100644
--- a/net/build.gradle
+++ b/net/build.gradle
@@ -1,21 +1,6 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
-
-    defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion rootProject.ext.compileSdkVersion
-        versionCode 1
-        versionName "1.0"
-    }
-
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-
     buildTypes {
         release {
             minifyEnabled false
diff --git a/snet/build.gradle b/snet/build.gradle
index 5ed9c6d22..575e504ad 100644
--- a/snet/build.gradle
+++ b/snet/build.gradle
@@ -1,13 +1,9 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
-
     defaultConfig {
         applicationId "com.topjohnwu.snet"
         minSdkVersion 14
-        targetSdkVersion rootProject.ext.compileSdkVersion
         versionCode 12
         versionName "snet"
     }