private void installIntoProjectLocalRepository(Artifact artifact) {
        String extension = artifact.getExtension();
        String classifier = artifact.getClassifier();
        if (Features.consumerPom(session.getUserProperties())) {
            if ("pom".equals(extension)) {
                if (classifier == null || classifier.isEmpty()) {
                    classifier = "build";
                } else if (classifier.equals("consumer")) {

     * by the user, e.g. via the {@code -Dkey=value} parameter on the command line.
     *
     * @return the user properties, never {@code null}
     */
    @Nonnull
    Map<String, String> getUserProperties();

    /**
     * Returns immutable system properties to use for interpolation. The system properties are collected from the
     * runtime environment such as {@link System#getProperties()} and environment variables