diff --git a/vtk.spec b/vtk.spec
index 1de7a13..e1a24a5 100644
--- a/vtk.spec
+++ b/vtk.spec
@@ -5,6 +5,9 @@
 # '_ZZNSt8__detail18__to_chars_10_implIjEEvPcjT_E8__digits@@LLVM_11'
 %global _lto_cflags %{nil}
 
+# There is a circular dep with opencascade
+%bcond bootstrap 0
+
 # OSMesa and X support are mutually exclusive.
 # TODO - buid separate OSMesa version if desired
 %bcond_with OSMesa
@@ -142,7 +145,9 @@ BuildRequires:  lz4-devel
 BuildRequires:  mariadb-connector-c-devel
 %{?with_OSMesa:BuildRequires: mesa-libOSMesa-devel}
 BuildRequires:  netcdf-cxx-devel
+%if %{without bootstrap}
 BuildRequires:  opencascade-devel
+%endif
 BuildRequires:  openslide-devel
 # Currently does not provide OpenVDBConfig.cmake
 #BuildRequires:  openvdb-devel
@@ -243,7 +248,9 @@ Requires: mariadb-connector-c-devel%{?_isa} \
 Requires: mesa-libOSMesa-devel%{?_isa} \
 %endif \
 Requires: netcdf-cxx-devel%{?_isa} \
+%if %{without bootstrap} \
 Requires: opencascade-devel%{?_isa} \
+%endif \
 Requires: openslide-devel%{?_isa} \
 #Requires: openvdb-devel%{?_isa} \
 Requires: openvr-devel%{?_isa} \
@@ -618,6 +625,9 @@ find vtk-examples -type f | xargs chmod -R a-x
  -DVTK_MODULE_ENABLE_VTK_ImagingOpenGL2:STRING=YES \\\
  -DVTK_MODULE_ENABLE_VTK_InfovisBoost:STRING=YES \\\
  -DVTK_MODULE_ENABLE_VTK_InfovisBoostGraphAlgorithms:STRING=YES \\\
+%if %{with bootstrap} \
+ -DVTK_MODULE_ENABLE_VTK_IOOCCT:STRING=NO \\\
+%endif \
  -DVTK_MODULE_ENABLE_VTK_IOFDS:STRING=YES \\\
  -DVTK_MODULE_ENABLE_VTK_IOH5part:STRING=YES \\\
  -DVTK_MODULE_ENABLE_VTK_IOH5Rage:STRING=YES \\\