/usr/include/vxl/contrib/mul/clsfy/ is in libvxl1-dev 1.17.0.dfsg2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/mul/clsfy/clsfy_adaboost_sorted_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_adaboost_trainer.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_add_all_loaders.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_1d_wrapper.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_1d_wrapper_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_hyperplane.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_hyperplane_gmrho_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_hyperplane_logit_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_hyperplane_ls_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_pdf_classifier.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_threshold_1d.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_threshold_1d_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_threshold_1d_gini_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_tree.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_binary_tree_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_builder_1d.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_builder_base.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_classifier_1d.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_classifier_base.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_direct_boost.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_direct_boost_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_k_nearest_neighbour.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_knn_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_logit_loss_function.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_mean_square_1d.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_mean_square_1d_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_null_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_null_classifier.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_parzen_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_random_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_random_classifier.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_random_forest.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_random_forest_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_rbf_parzen.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_rbf_svm.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_rbf_svm_smo_1_builder.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_simple_adaboost.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_smo_1.h
/usr/include/vxl/contrib/mul/clsfy/clsfy_smo_base.h