Fix gradle issues (compiling works again)

build.gradle

@@ -2,21 +2,23 @@ buildscript {
     repositories {
         maven { url = 'https://files.minecraftforge.net' }
         mavenCentral()
-        // potential replacement in case of problems:
-		// https://dist.creeper.host/Sponge/maven
+        // potential replacement in case of problems: https://dist.creeper.host/Sponge/maven
 		maven { url = 'https://repo.spongepowered.org/maven/' }
 		// used to download and compile dependencies from git repos
 		maven { url 'https://jitpack.io' }
         gradlePluginPortal()
     }
     dependencies {
-        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '5.1.+', changing: true
+    	// Note to self: Don't try to update ForgeGradle!
+    	// As of 11-27-2021 Mixins don't work on Gradle 7, 
+    	// which the newer versions of ForgeGradle use
+        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '3+', changing: true
 		classpath group: 'org.spongepowered', name: 'mixingradle', version: '0.7-SNAPSHOT'
     }
 }
 
 plugins {
-    id "com.github.johnrengelman.shadow" version "7.0.0"
+    id "com.github.johnrengelman.shadow" version "4.0.4"
 }
 
 apply plugin: 'net.minecraftforge.gradle'
@@ -40,7 +42,7 @@ minecraft {
     // Use non-default mappings at your own risk. they may not always work.
     // Simply re-run your setup task after changing the mappings to update your workspace.
 	mappings channel: 'official', version: '1.16.5'
-
+	
     // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.
     
     accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')
@@ -121,8 +123,19 @@ minecraft {
     }
 }
 
-// Include resources generated by data generators.
-sourceSets.main.resources { srcDir 'src/generated/resources' }
+sourceSets {
+    main {
+        java {
+        	// add Distant Horizon's Core source folders
+            srcDirs("core/src/main/java");
+            srcDirs("core/src/main/resources")
+        }
+        resources {
+        	// Include resources generated by data generators.
+        	srcDir("src/generated/resources")
+        }
+    }
+}
 
 // this is required so that we can use 
 // jitpack in the dependencies section below 
@@ -142,8 +155,10 @@ dependencies {
     // that the dep is a ForgeGradle 'patcher' dependency. And it's patches will be applied.
     // The userdev artifact is a special name and will get all sorts of transformations applied to it.
     minecraft 'net.minecraftforge:forge:1.16.5-36.1.0'
-
-
+	
+	// required to generate the mixin refmap
+	annotationProcessor 'org.spongepowered:mixin:0.8:processor'
+	
     implementation 'org.tukaani:xz:1.9'
     shadowMe 'org.tukaani:xz:1.9'
     implementation 'org.apache.commons:commons-compress:1.21'
@@ -179,7 +194,6 @@ dependencies {
     // For more info...
     // http://www.gradle.org/docs/current/userguide/artifact_dependencies_tutorial.html
     // http://www.gradle.org/docs/current/userguide/dependency_management.html
-
 }
 
 task copyCoreResources(type: Copy) {
@@ -251,14 +265,6 @@ publishing {
 
 mixin {
     add sourceSets.main, "lod.refmap.json"
+    config "lod.mixins.json"
 }
 
-// add Distant Horizon's Core source folders
-sourceSets {
-    main {
-        java {
-            srcDirs("core/src/main/java");
-            srcDirs("core/src/main/resources")
-        }
-    }
-}

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists