diff --git a/CMakeLists.txt b/CMakeLists.txt
index 90b48c26..0c85e417 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -471,11 +471,10 @@ add_library(MayoIO STATIC ${MayoIO_HeaderFiles} ${MayoIO_SourceFiles})
 target_include_directories(MayoIO PRIVATE ${Mayo_IncludeDirectories})
 target_compile_definitions(MayoIO PRIVATE ${Mayo_CompileDefinitions})
 target_compile_options(MayoIO PRIVATE ${Mayo_CompileOptions})
-target_link_libraries(MayoIO PRIVATE ${MayoIO_LinkLibraries})
+target_link_libraries(MayoIO PRIVATE MayoCore ${MayoIO_LinkLibraries})
 
 add_library(MayoIOLib INTERFACE)
-target_link_libraries(MayoIOLib INTERFACE MayoIO ${MayoIO_LinkLibraries})
-target_include_directories(MayoIOLib INTERFACE ${Mayo_IncludeDirectories})
+target_link_libraries(MayoIOLib INTERFACE MayoIO MayoCoreLib ${MayoIO_LinkLibraries})
 
 ##########
 # Target: MayoApp
@@ -555,6 +554,8 @@ if(Mayo_BuildApp)
     target_compile_definitions(mayo PRIVATE ${Mayo_CompileDefinitions})
     target_compile_options(mayo PRIVATE ${Mayo_CompileOptions})
     target_link_libraries(mayo PRIVATE ${MayoApp_LinkLibraries})
+    # Required by generated Qt UI files
+    target_include_directories(mayo PRIVATE ${PROJECT_SOURCE_DIR}/src/app)
 
     set_target_properties(
         mayo
diff --git a/src/graphics/graphics_utils.cpp b/src/graphics/graphics_utils.cpp
index f44e89ce..84cfea4c 100644
--- a/src/graphics/graphics_utils.cpp
+++ b/src/graphics/graphics_utils.cpp
@@ -10,6 +10,7 @@
 #include "../base/math_utils.h"
 #include "../base/tkernel_utils.h"
 
+#include <Aspect_DisplayConnection.hxx>
 #include <Bnd_Box.hxx>
 #include <ElSLib.hxx>
 #include <Image_PixMap.hxx>
@@ -206,7 +207,7 @@ int GraphicsUtils::AspectWindow_height(const Handle_Aspect_Window& wnd)
     return h;
 }
 
-Handle_Aspect_DisplayConnection GraphicsUtils::AspectDisplayConnection_create()
+OccHandle<Aspect_DisplayConnection> GraphicsUtils::AspectDisplayConnection_create()
 {
 #if (!defined(MAYO_OS_WINDOWS) && (!defined(MAYO_OS_MAC) || defined(MACOSX_USE_GLX)))
     return new Aspect_DisplayConnection(std::getenv("DISPLAY"));
diff --git a/src/graphics/graphics_utils.h b/src/graphics/graphics_utils.h
index b0913aff..256201c3 100644
--- a/src/graphics/graphics_utils.h
+++ b/src/graphics/graphics_utils.h
@@ -6,15 +6,19 @@
 
 #pragma once
 
+#include "../base/occ_handle.h"
 #include "graphics_object_ptr.h"
 #include <AIS_InteractiveContext.hxx>
 #include <AIS_InteractiveObject.hxx>
-#include <Aspect_DisplayConnection.hxx>
 #include <Aspect_Grid.hxx>
 #include <Aspect_Window.hxx>
 #include <V3d_View.hxx>
 #include <V3d_Viewer.hxx>
 class Image_PixMap;
+// Note: can't include Aspect_DisplayConnection.hxx as this is causing name conflicts 
+// with XLib in other files(with GraphicsObjectDriver::Support::None)
+// This seems to happen only for OpenCascade <= v7.5
+class Aspect_DisplayConnection;
 
 namespace Mayo {
 
@@ -51,7 +55,7 @@ struct GraphicsUtils {
 
     static int AspectWindow_width(const Handle_Aspect_Window& wnd);
     static int AspectWindow_height(const Handle_Aspect_Window& wnd);
-    static Handle_Aspect_DisplayConnection AspectDisplayConnection_create();
+    static OccHandle<Aspect_DisplayConnection> AspectDisplayConnection_create();
 
     static void Gfx3dClipPlane_setCappingHatch(
             const Handle_Graphic3d_ClipPlane& plane, Aspect_HatchStyle hatch
diff --git a/src/qtbackend/qt_app_translator.cpp b/src/qtbackend/qt_app_translator.cpp
index 073c160f..64a6c329 100644
--- a/src/qtbackend/qt_app_translator.cpp
+++ b/src/qtbackend/qt_app_translator.cpp
@@ -4,8 +4,6 @@
 ** See license at https://github.com/fougue/mayo/blob/master/LICENSE.txt
 ****************************************************************************/
 
-#pragma once
-
 #include "qt_app_translator.h"
 
 #include <QtCore/QCoreApplication>