diff --git a/dtool/src/cppparser/cppPreprocessor.cxx b/dtool/src/cppparser/cppPreprocessor.cxx
index 8d9cd6b3dc..f51a2e8b2a 100644
--- a/dtool/src/cppparser/cppPreprocessor.cxx
+++ b/dtool/src/cppparser/cppPreprocessor.cxx
@@ -1473,7 +1473,7 @@ handle_include_directive(const string &args, int first_line,
 
       // Don't include it if we included it before and it had #pragma once.
       ParsedFiles::const_iterator it = _parsed_files.find(file);
-      if (it->_pragma_once) {
+      if (it != _parsed_files.end() && it->_pragma_once) {
         return;
       }
 
diff --git a/dtool/src/dtoolbase/atomicAdjustGccImpl.I b/dtool/src/dtoolbase/atomicAdjustGccImpl.I
index 3e462f01cf..6831a16a1e 100644
--- a/dtool/src/dtoolbase/atomicAdjustGccImpl.I
+++ b/dtool/src/dtoolbase/atomicAdjustGccImpl.I
@@ -125,7 +125,7 @@ compare_and_exchange(TVOLATILE AtomicAdjustGccImpl::Integer &mem,
                      AtomicAdjustGccImpl::Integer old_value,
                      AtomicAdjustGccImpl::Integer new_value) {
 
-  __atomic_compare_exchange_n(&mem, &old_value, new_value, true,
+  __atomic_compare_exchange_n(&mem, &old_value, new_value, false,
                               __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
   return old_value;
 }
@@ -142,7 +142,7 @@ compare_and_exchange_ptr(TVOLATILE AtomicAdjustGccImpl::Pointer &mem,
                          AtomicAdjustGccImpl::Pointer old_value,
                          AtomicAdjustGccImpl::Pointer new_value) {
 
-  __atomic_compare_exchange_n(&mem, &old_value, new_value, true,
+  __atomic_compare_exchange_n(&mem, &old_value, new_value, false,
                               __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
   return old_value;
 }
diff --git a/dtool/src/dtoolutil/pandaSystem.cxx b/dtool/src/dtoolutil/pandaSystem.cxx
index d54029ecf2..2663797172 100644
--- a/dtool/src/dtoolutil/pandaSystem.cxx
+++ b/dtool/src/dtoolutil/pandaSystem.cxx
@@ -270,6 +270,11 @@ get_compiler() {
 
   return strm.str();
 
+#elif defined(__clang__)
+  // Clang has this macro.  This case has to go before __GNUC__
+  // because that is also defined by clang.
+  return "Clang " __clang_version__;
+
 #elif defined(__GNUC__)
   // GCC defines this simple macro.
   return "GCC " __VERSION__;
diff --git a/panda/src/pgraph/cullTraverser.h b/panda/src/pgraph/cullTraverser.h
index a174be5b3d..21aa8619d7 100644
--- a/panda/src/pgraph/cullTraverser.h
+++ b/panda/src/pgraph/cullTraverser.h
@@ -112,9 +112,6 @@ private:
   static CPT(RenderState) get_bounds_outer_viz_state();
   static CPT(RenderState) get_bounds_inner_viz_state();
   static CPT(RenderState) get_depth_offset_state();
-  void start_decal(const CullTraverserData &data);
-  CullableObject *r_get_decals(CullTraverserData &data,
-                               CullableObject *decals);
 
   GraphicsStateGuardianBase *_gsg;
   Thread *_current_thread;
diff --git a/pandatool/src/xfileegg/xFileMesh.cxx b/pandatool/src/xfileegg/xFileMesh.cxx
index 73e473b087..979650d74e 100644
--- a/pandatool/src/xfileegg/xFileMesh.cxx
+++ b/pandatool/src/xfileegg/xFileMesh.cxx
@@ -212,6 +212,13 @@ add_material(EggPrimitive *egg_prim) {
 ////////////////////////////////////////////////////////////////////
 int XFileMesh::
 add_vertex(XFileVertex *vertex) {
+  if (vertex->_has_color) {
+    _has_colors = true;
+  }
+  if (vertex->_has_uv) {
+    _has_uvs = true;
+  }
+
   int next_index = _vertices.size();
   _unique_vertices.insert(UniqueVertices::value_type(vertex, next_index));
   _vertices.push_back(vertex);
@@ -228,6 +235,10 @@ add_vertex(XFileVertex *vertex) {
 ////////////////////////////////////////////////////////////////////
 int XFileMesh::
 add_normal(XFileNormal *normal) {
+  if (normal->_has_normal) {
+    _has_normals = true;
+  }
+
   int next_index = _normals.size();
   _unique_normals.insert(UniqueNormals::value_type(normal, next_index));
   _normals.push_back(normal);
@@ -244,6 +255,10 @@ add_normal(XFileNormal *normal) {
 ////////////////////////////////////////////////////////////////////
 int XFileMesh::
 add_material(XFileMaterial *material) {
+  if (material->has_material()) {
+    _has_materials = true;
+  }
+
   int next_index = _materials.size();
   _unique_materials.insert(UniqueMaterials::value_type(material, next_index));
   _materials.push_back(material);