diff --git a/install.sh b/install.sh
index 9ef69246272e84bb8aa6796fb8e25af82bf77862..3aff6ae32fb81b6d392891af6c77c6dc820599fd 100755
--- a/install.sh
+++ b/install.sh
@@ -27,7 +27,7 @@ cd VTK-9.0.1
 mkdir build
 cd build
 export ospray_DIR=../../ospray-1.8.5/lib/cmake/ospray-1.8.5
-../../cmake-3.19.4/bin/cmake .. -DVTK_MODULE_ENABLE_VTK_RenderingRayTracing=YES
+../../cmake-3.19.4/bin/cmake .. -DVTK_MODULE_ENABLE_VTK_RenderingRayTracing=YES -DVTK_OPENGL_HAS_OSMESA=ON -DVTK_USE_X=OFF
 ../../cmake-3.19.4/bin/cmake --build . --config Release --parallel 64
 
 # Install application.
diff --git a/offline_ray_tracer/source/main.cpp b/offline_ray_tracer/source/main.cpp
index 5fde3bc06423f2bffa27487a6dafbe068c64853b..03ef7b033ede9da9713bfd55000097c7b3157c4c 100644
--- a/offline_ray_tracer/source/main.cpp
+++ b/offline_ray_tracer/source/main.cpp
@@ -9,7 +9,6 @@
 #include <vtkPolyDataMapper.h>
 #include <vtkRenderer.h>
 #include <vtkRenderWindow.h>
-#include <vtkRenderWindowInteractor.h>
 #include <vtkSmartPointer.h>
 #include <vtkUnstructuredGridVolumeRayCastMapper.h>
 #include <vtkVolume.h>