build.gradle

import java.nio.file.Paths
import java.nio.file.Files

apply plugin: 'cpp'

model {
    repositories {
        libs(PrebuiltLibraries) {
            jvm {
                /* Fails with
> Exception thrown while executing model rule: repositories { ... } @ build.gradle line 7, column 5
   > Could not find method findJdkIncludePath() for arguments [] on object of type org.gradle.nativeplatform.internal.prebuilt.DefaultPrebuiltLibrary.
                */
                println findJdkIncludePath()
            }
        }
    }

    components {
        main(NativeLibrarySpec) {
            sources {
                cpp {
                    /* Fails with
> Exception thrown while executing model rule: main(org.gradle.nativeplatform.NativeLibrarySpec) { ... } @ build.gradle line 16, column 9 > named(cpp)
   > No signature of method: sun.nio.fs.UnixPath.resolve() is applicable for argument types: (org.codehaus.groovy.runtime.GStringImpl, java.lang.String) values: [jdk1.8.0_60, include]
     Possible solutions: resolve(java.lang.String), resolve(java.nio.file.Path)
                    */
                    println findJdkIncludePath()
                    lib library: "jvm", linkage: "api"
                }
            }
        }
    }
}

def findJdkIncludePath() {
    def programFilesJava = Paths.get(null, "Java")
    def javaVersion = System.properties['java.version']
    // Throws MethodMissingException
    return programFilesJava.resolve("jdk${javaVersion}", "include")
}