Partial gradle build file

build.gradle.kts

//...

group = "sample"
version = "0.0.1"

val kotlinMultiplatformVersion = "1.3.40"
//...
val protobufPluginVersion = "0.8.10"
//...

project.extensions.add("protobuf", ProtobufConfigurator(project, null))

buildscript {
    repositories {
        //...
    }
    dependencies {
        classpath("com.google.protobuf:protobuf-gradle-plugin:+")
        classpath(kotlin("gradle-plugin", "1.3.40"))
    }
}


apply {
    plugin<ProtobufPlugin>()
}

allprojects {
    repositories {
//...
    }
}


repositories {
//...
}


dependencies {
    implementation("com.google.protobuf:protobuf-java:3.6.1")
//...

    if (JavaVersion.current().isJava9Compatible) {
        implementation("javax.annotation:javax.annotation-api:+")
    }
}


plugins {
//...
    id("kotlin-multiplatform") version "1.3.40"
    id("com.google.protobuf") version "0.8.10"
//...
}

//...

tasks.withType<KotlinCompile> {
    dependsOn.add("generateProto")
    //...
}

//...

kotlin {
    targets.add(presets["jvm"].createTarget("jvm"))
//...

    sourceSets.apply {
        val commonMain = getByName("commonMain") {
            dependencies {
                //...
                implementation("com.google.protobuf:protobuf-gradle-plugin:0.8.10")
                implementation("com.google.protobuf:protobuf-java:3.6.1")
                //...
            }
        }

        val commonTest = getByName("commonTest") {
            dependencies {
              //...
            }
        }

        val allJvmMain = create("allJvmMain") {
           //...
        }

        configure(listOf(getByName("jvmMain")/*, getByName("androidMain")*/)) {
            dependsOn(allJvmMain)
        }
//...
    }
}


configure<ProtobufConfigurator> {
    generatedFilesBaseDir = "$projectDir/src/"

    protoc {
        artifact = "com.google.protobuf:protoc:3.9.0"
    }

    plugins {
        id("javalite") {
            artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0"
        }
        id("krotoPlus") {
            //            artifact = "com.github.marcoferrer.krotoplus:protoc-gen-kroto-plus:+:jvm8@jar"
            path = "/home/robert/projects/kroto-plus/protoc-gen-kroto-plus/build/libs/protoc-gen-kroto-plus-0.4.0-jvm8.jar"
        }
    }

    generateProtoTasks {
        val krotoConfig = file("$projectDir/krotoPlusConfig.yaml")

        all().forEach {
            it.inputs.files.plus(krotoConfig)

            it.builtins {
                remove("java")
            }
            it.plugins {
                id("javalite") {
                    outputSubDir = "java"
                }

                id("krotoPlus") {
                    println("kroto")
                    outputSubDir = "java"
                    option("ConfigPath=$projectDir/krotoPlusConfig.yaml")
                }
            }
        }
    }
}

//...