diff --git a/cmake/ACGCommon.cmake b/cmake/ACGCommon.cmake
index d07efbcf..cfe43a4c 100644
--- a/cmake/ACGCommon.cmake
+++ b/cmake/ACGCommon.cmake
@@ -145,6 +145,7 @@ macro (acg_qt4)
     set (QT_USE_QTSCRIPT 1)
     set (QT_USE_QTSQL 1)
     set (QT_USE_QTXML 1)
+    set (QT_USE_QTXMLPATTERNS 1)
     set (QT_USE_QTHELP 1)
     set (QT_USE_QTWEBKIT 1)
     set (QT_USE_QTUITOOLS 1)
@@ -497,23 +498,27 @@ function (acg_add_library _target _libtype)
                             ${CMAKE_BINARY_DIR}/Build/${ACG_PROJECT_LIBDIR}/lib${_target}.a)
 
   endif ()
-  
-  if (NOT ACG_PROJECT_MACOS_BUNDLE OR NOT APPLE)
-    if (${_type} STREQUAL SHARED OR ${_type} STREQUAL STATIC )
-      install (TARGETS ${_target}
-               RUNTIME DESTINATION ${ACG_PROJECT_BINDIR}
-               LIBRARY DESTINATION ${ACG_PROJECT_LIBDIR}
-               ARCHIVE DESTINATION ${ACG_PROJECT_LIBDIR})
-      if (_and_static)
-        install (FILES ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}Static.a
-                 DESTINATION ${ACG_PROJECT_LIBDIR}
-                 RENAME lib${_target}.a
-                 PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+ 
+
+  # Block installation of libraries by setting ACG_NO_LIBRARY_INSTALL
+  if ( NOT ACG_NO_LIBRARY_INSTALL ) 
+    if (NOT ACG_PROJECT_MACOS_BUNDLE OR NOT APPLE)
+      if (${_type} STREQUAL SHARED OR ${_type} STREQUAL STATIC )
+        install (TARGETS ${_target}
+                 RUNTIME DESTINATION ${ACG_PROJECT_BINDIR}
+                 LIBRARY DESTINATION ${ACG_PROJECT_LIBDIR}
+                 ARCHIVE DESTINATION ${ACG_PROJECT_LIBDIR})
+        if (_and_static)
+          install (FILES ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${_target}Static.a
+                   DESTINATION ${ACG_PROJECT_LIBDIR}
+                   RENAME lib${_target}.a
+                   PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+        endif ()
+      elseif (${_type} STREQUAL MODULE)
+        install (TARGETS ${_target} DESTINATION ${ACG_PROJECT_PLUGINDIR})
       endif ()
-    elseif (${_type} STREQUAL MODULE)
-      install (TARGETS ${_target} DESTINATION ${ACG_PROJECT_PLUGINDIR})
     endif ()
-  endif ()
+  endif()
 
 endfunction ()
 
diff --git a/src/OpenMesh/Core/CMakeLists.txt b/src/OpenMesh/Core/CMakeLists.txt
index 340ce48e..28ee74b3 100644
--- a/src/OpenMesh/Core/CMakeLists.txt
+++ b/src/OpenMesh/Core/CMakeLists.txt
@@ -24,6 +24,12 @@ set (directories
 acg_append_files (headers "*.hh" ${directories})
 acg_append_files (sources "*.cc" ${directories})
 
+# Disable Library installation when not building OpenMesh on its own but as part of another project!
+if ( NOT ${PROJECT_NAME} MATCHES "OpenMesh")
+  set(ACG_NO_LIBRARY_INSTALL true)
+endif()
+
+
 if (WIN32)
   # OpenMesh has no dll exports so we have to build a static library on windows
   acg_add_library (OpenMeshCore STATIC ${sources} ${headers})
diff --git a/src/OpenMesh/Tools/CMakeLists.txt b/src/OpenMesh/Tools/CMakeLists.txt
index 674b37cc..5831db99 100644
--- a/src/OpenMesh/Tools/CMakeLists.txt
+++ b/src/OpenMesh/Tools/CMakeLists.txt
@@ -26,6 +26,12 @@ IF(WIN32)
   acg_append_files (sources "*.c" ${directories})
 ENDIF(WIN32)
 
+# Disable Library installation when not building OpenMesh on its own but as part of another project!
+if ( NOT ${PROJECT_NAME} MATCHES "OpenMesh")
+  set(ACG_NO_LIBRARY_INSTALL true)
+endif()
+
+
 if (WIN32)
   # OpenMesh has no dll exports so we have to build a static library on windows
   acg_add_library (OpenMeshTools STATIC ${sources} ${headers})