diff --git a/CMakeLists.txt b/CMakeLists.txt
index 38ce8689855..b54b18aab37 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1267,6 +1267,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 	ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_POINTER_ARITH -Wpointer-arith)
 	ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_UNUSED_PARAMETER -Wunused-parameter)
 	ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_WRITE_STRINGS -Wwrite-strings)
+	ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_UNDEFINED -Wundef)
 	# disable because it gives warnings for printf() & friends.
 	# ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_DOUBLE_PROMOTION -Wdouble-promotion -Wno-error=double-promotion)
 	ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_NO_ERROR_UNUSED_BUT_SET_VARIABLE -Wno-error=unused-but-set-variable)
@@ -1274,6 +1275,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 	ADD_CHECK_CXX_COMPILER_FLAG(CXX_WARNINGS CXX_WARN_ALL -Wall)
 	ADD_CHECK_CXX_COMPILER_FLAG(CXX_WARNINGS CXX_WARN_NO_INVALID_OFFSETOF -Wno-invalid-offsetof)
 	ADD_CHECK_CXX_COMPILER_FLAG(CXX_WARNINGS CXX_WARN_NO_SIGN_COMPARE -Wno-sign-compare)
+	ADD_CHECK_CXX_COMPILER_FLAG(CXX_WARNINGS CXX_WARN_UNDEFINED -Wundef)
 
 elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
 
diff --git a/intern/opennl/CMakeLists.txt b/intern/opennl/CMakeLists.txt
index 55b0bc5855f..7d6a579819e 100644
--- a/intern/opennl/CMakeLists.txt
+++ b/intern/opennl/CMakeLists.txt
@@ -31,6 +31,13 @@ remove_strict_flags()
 # and debug gives a lot of prints on UV unwrapping. developers can enable if they need to.
 remove_flag("-DDEBUG")
 
+
+# quiet compiler warnings about undefined defines
+add_definitions(
+	-DDEBUGlevel=0
+	-DPRNTlevel=0
+)
+
 set(INC
 	extern
 	superlu
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 6f34383101d..481893b86a8 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -158,7 +158,7 @@ void ntreeInitTypes(bNodeTree *ntree)
 	ntree->init |= NTREE_TYPE_INIT;
 }
 
-static bNodeSocket *make_socket(bNodeTree *ntree, int in_out, const char *name, int type)
+static bNodeSocket *make_socket(bNodeTree *UNUSED(ntree), int in_out, const char *name, int type)
 {
 	bNodeSocketType *stype= ntreeGetSocketType(type);
 	bNodeSocket *sock;
diff --git a/source/blender/editors/space_node/node_draw.c b/source/blender/editors/space_node/node_draw.c
index ec118bb3ca2..6be8978cb5b 100644
--- a/source/blender/editors/space_node/node_draw.c
+++ b/source/blender/editors/space_node/node_draw.c
@@ -549,7 +549,7 @@ static void node_draw_basis(const bContext *C, ARegion *ar, SpaceNode *snode, bN
 	bNodeSocket *sock;
 	rctf *rct= &node->totr;
 	float iconofs;
-	float socket_size= NODE_SOCKSIZE*U.dpi/72;
+	/* float socket_size= NODE_SOCKSIZE*U.dpi/72; */ /* UNUSED */
 	float iconbutw= 0.8f*UI_UNIT_X;
 	int color_id= node_get_colorid(node);
 	char showname[128]; /* 128 used below */
diff --git a/source/blender/editors/space_node/node_edit.c b/source/blender/editors/space_node/node_edit.c
index 214f375855d..b5633d50997 100644
--- a/source/blender/editors/space_node/node_edit.c
+++ b/source/blender/editors/space_node/node_edit.c
@@ -2175,7 +2175,6 @@ static int node_duplicate_exec(bContext *C, wmOperator *op)
 	bNode *node, *newnode, *lastnode;
 	bNodeLink *link, *newlink, *lastlink;
 	int keep_inputs = RNA_boolean_get(op->ptr, "keep_inputs");
-	bNodeSocket *sock;
 	
 	ED_preview_kill_jobs(C);
 	
diff --git a/source/gameengine/Converter/BL_SkinDeformer.cpp b/source/gameengine/Converter/BL_SkinDeformer.cpp
index 3a379e8b0ed..98afcf877a1 100644
--- a/source/gameengine/Converter/BL_SkinDeformer.cpp
+++ b/source/gameengine/Converter/BL_SkinDeformer.cpp
@@ -243,7 +243,6 @@ void BL_SkinDeformer::BGEDeformVerts()
 	for (int i=0; i<m_bmesh->totvert; ++i)
 	{
 		float contrib = 0.f, weight, max_weight=0.f;
-		Bone *bone;
 		bPoseChannel *pchan=NULL;
 		MDeformVert *dvert;
 		Eigen::Map<Eigen::Vector3f> norm(m_transnors[i]);
@@ -266,7 +265,6 @@ void BL_SkinDeformer::BGEDeformVerts()
 			if (index < numGroups && (pchan=m_dfnrToPC[index]))
 			{
 				weight = dvert->dw[j].weight;
-				bone = pchan->bone;
 
 				if (weight)
 				{
diff --git a/source/gameengine/Converter/KX_BlenderSceneConverter.cpp b/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
index 7191730187c..656dcfa3220 100644
--- a/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
+++ b/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
@@ -385,6 +385,12 @@ void KX_BlenderSceneConverter::ConvertScene(class KX_Scene* destinationscene,
 	//This cache mecanism is buggy so I leave it disable and the memory leak
 	//that would result from this is fixed in RemoveScene()
 	m_map_mesh_to_gamemesh.clear();
+
+#ifndef USE_BULLET
+	/* quiet compiler warning */
+	(void)useDbvtCulling;
+#endif
+
 }
 
 // This function removes all entities stored in the converter for that scene