Native binary build failure: Could not find method libs()

I’m just getting my feet wet with the native build support, and have this simple build script:

apply plugin: 'cpp'

model {

    platforms {
        x86 { architecture 'x86' }
        x64 { architecture 'x86_64' }
    }
    
    buildTypes {
        debug
        release
    }
    
    binaries {
        all {
            if ( toolChain in VisualCpp ) {
                cppCompiler.args "/EHsc"
                if ( buildType == buildTypes.debug ) {
                    cppCompiler.define "DEBUG" 
                }
            }
        }
    }

    repositories {
        libs(PrebuiltLibraries) {
            hello {
                headers.srcDir = project.projectDir + "../hello/Include"
            }
        }
    }

    components {
        goodbye(NativeLibrarySpec) {
            sources {
                cpp.lib library: 'hello', linkage: 'api'
            }
        }
    }
}

It’s a simple library with one source file that has a dependency on another library. My understanding of the technique to use for expressing this dependency is to use the repositories closure containing an entry for libs(PrebuiltLibraries).

Gradle is not happy with this, though, issuing this error:

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Users\hoobajoob\Documents\Eclipse\workspace-sts-luna\cdt.gradle.goodbye\build.gradle' line: 27

* What went wrong:
Exception thrown while executing model rule: model.repositories @ build.gradle line 26, column 5
> Could not find method libs() for arguments [interface org.gradle.nativeplatform.PrebuiltLibraries, build_7bgjdveru7rs4jelxyvxt3289$_run_closure1$_closure8$_closure13@22c75458] on root project 'cdt.gradle.goodbye'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

What have I missed?

Ha! Nothing like posting a question to illuminate the answer.

Problem was in a poorly formed configuration for headers.srcDir. Fix was to change the repositories closure like so:

    repositories {
        libs(PrebuiltLibraries) {
            hello {
                headers.srcDir '../hello/Include'
            }
        }
    }

All is well now!