import com.google.common.collect.ImmutableMap;

import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class BuildableCompilationState {
    private final Map<File, SourceFileState> sourceFileStates = new HashMap<File, SourceFileState>();

    public Set<File> getSourceInputs() {
        return sourceFileStates.keySet();
    }

    }

    private class DefaultIncrementalCompileSourceProcessor implements IncrementalCompileSourceProcessor {
        private final CompilationState previous;
        private final BuildableCompilationState current = new BuildableCompilationState();
        private final List<File> toRecompile = new ArrayList<File>();
        private final Set<File> existingHeaders = new HashSet<File>();

Class <org.gradle.language.nativeplatform.internal.incremental.BuildableCompilationState> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (BuildableCompilationState.java:0)