From 8d602087d1cd03cbc39cb7df0c6a56a1a3b227d4 Mon Sep 17 00:00:00 2001
From: Saurabh7 <saurabh.mahindre@gmail.com>
Date: Fri, 12 Aug 2016 10:07:53 +0530
Subject: [PATCH] fix guards KNN

---
 src/shogun/multiclass/KNN.cpp         | 10 +++++++++-
 src/shogun/multiclass/KNN.h           |  6 ++++++
 tests/unit/multiclass/KNN_unittest.cc |  3 +++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/shogun/multiclass/KNN.cpp b/src/shogun/multiclass/KNN.cpp
index 36288a1c4f5..2b813f9e324 100644
--- a/src/shogun/multiclass/KNN.cpp
+++ b/src/shogun/multiclass/KNN.cpp
@@ -20,8 +20,12 @@
 #include <shogun/lib/Time.h>
 #include <shogun/base/Parameter.h>
 #include <shogun/multiclass/tree/KDTree.h>
-#include <shogun/lib/external/falconn/lsh_nn_table.h>
 #include <shogun/mathematics/eigen3.h>
+
+#ifdef HAVE_CXX11
+#include <shogun/lib/external/falconn/lsh_nn_table.h>
+#endif
+
 //#define DEBUG_KNN
 
 using namespace shogun;
@@ -60,8 +64,10 @@ void CKNN::init()
 	m_num_classes=0;
 	m_leaf_size=1;
 	m_knn_solver=KNN_BRUTE;
+#ifdef HAVE_CXX11
 	m_lsh_l = 0;
 	m_lsh_t = 0;
+#endif
 
 	/* use the method classify_multiply_k to experiment with different values
 	 * of k */
@@ -291,6 +297,7 @@ CMulticlassLabels* CKNN::apply_multiclass(CFeatures* data)
 		SG_UNREF(query);
 		break;
 	}
+#ifdef HAVE_CXX11
 	case KNN_LSH:
 	{
 		CDenseFeatures<float64_t>* features = dynamic_cast<CDenseFeatures<float64_t>*>(distance->get_lhs());
@@ -347,6 +354,7 @@ CMulticlassLabels* CKNN::apply_multiclass(CFeatures* data)
 		SG_UNREF(query_features);
 		break;
 	}
+#endif /* HAVE_CXX11 */
 	}
 
 	SG_FREE(classes);
diff --git a/src/shogun/multiclass/KNN.h b/src/shogun/multiclass/KNN.h
index 11d68c01242..437c7294c14 100644
--- a/src/shogun/multiclass/KNN.h
+++ b/src/shogun/multiclass/KNN.h
@@ -29,7 +29,9 @@ namespace shogun
 		KNN_BRUTE,
 		KNN_KDTREE,
 		KNN_COVER_TREE,
+#ifdef HAVE_CXX11
 		KNN_LSH
+#endif
 	};
 
 class CDistanceMachine;
@@ -197,6 +199,7 @@ class CKNN : public CDistanceMachine
 			m_knn_solver = knn_solver;
 		}
 
+#ifdef HAVE_CXX11
 		/** set parameters for LSH solver
 		  * @param l number of hash tables for LSH
 		  * @param t number of probes per query for LSH
@@ -206,6 +209,7 @@ class CKNN : public CDistanceMachine
 			m_lsh_l = l;
 			m_lsh_t = t;
 		}
+#endif
 
 	protected:
 		/** Stores feature data of underlying model.
@@ -285,11 +289,13 @@ class CKNN : public CDistanceMachine
 
 		int32_t m_leaf_size;
 
+#ifdef HAVE_CXX11
 		/* Number of hash tables for LSH */
 		int32_t m_lsh_l;
 
 		/* Number of probes per query for LSH */
 		int32_t m_lsh_t;
+#endif
 };
 
 }
diff --git a/tests/unit/multiclass/KNN_unittest.cc b/tests/unit/multiclass/KNN_unittest.cc
index a0bf180c2f5..08c2610f7f5 100644
--- a/tests/unit/multiclass/KNN_unittest.cc
+++ b/tests/unit/multiclass/KNN_unittest.cc
@@ -8,6 +8,7 @@
 
 using namespace shogun;
 
+#ifdef HAVE_LAPACK
 void generate_knn_data(SGMatrix<float64_t>& feat, SGVector<float64_t>& lab,
 	   	int32_t num, int32_t classes, int32_t feats)
 {
@@ -205,3 +206,5 @@ TEST(KNN, classify_multiple_kdtree)
 	SG_UNREF(features_test);
 	SG_UNREF(labels_test);
 }
+#endif /* HAVE_LAPACK */
+