diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e5505a..0007015 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,10 @@ ELSEIF ( NOT OCE_FOUND AND OCC_FOUND )
   SET(OPENCASCADE_INCLUDE_DIRS ${OpenCASCADE_INCLUDE_DIR})
 ENDIF() 
 
-FIND_PACKAGE(CGAL REQUIRED COMPONENTS Core)
+#FIND_PACKAGE(CGAL QUIET) # REQUIRED COMPONENTS Core)
+
+IF(NOT CGAL_FOUND)
+  MESSAGE(STATUS "CGAL not found, not building CGAL components")
+ENDIF()
 
 ADD_SUBDIRECTORY(src)
diff --git a/cmake/FindCGAL.cmake b/cmake/FindCGAL.cmake
index 6aa18bf..dfc56b3 100644
--- a/cmake/FindCGAL.cmake
+++ b/cmake/FindCGAL.cmake
@@ -4,9 +4,14 @@ find_path(CGAL_CMAKE_CONFIG NAMES CGALConfig.cmake
   # ubuntu path
   PATHS /usr/lib/x86_64-linux-gnu/
   PATHS /usr/local/Cellar/cgal/4.12/lib/
+  PATHS /usr/include/CGAL
   PATH_SUFFIXES lib Lib cmake cmake/CGAL
   NO_DEFAULT_PATH)
 
-message(STATUS "Found CGAL in ${CGAL_CMAKE_CONFIG}")
-
-include(${CGAL_CMAKE_CONFIG}/CGALConfig.cmake)
+if(CGAL_CMAKE_CONFIG_STREQUAL "CGAL_CMAKE_CONFIG-NOTFOUND")
+  set(CGAL_FOUND FALSE)
+else()
+  set(CGAL_FOUND TRUE)
+  message(STATUS "Found CGAL in ${CGAL_CMAKE_CONFIG}")
+  include(${CGAL_CMAKE_CONFIG}/CGALConfig.cmake)
+endif()
diff --git a/cmake/FindMOAB.cmake b/cmake/FindMOAB.cmake
index 7c216e8..bec9a43 100644
--- a/cmake/FindMOAB.cmake
+++ b/cmake/FindMOAB.cmake
@@ -10,7 +10,7 @@
 find_path(MOAB_CMAKE_CONFIG NAMES MOABConfig.cmake
   HINTS ${MOAB_ROOT}
   PATHS ENV LD_LIBRARY_PATH DYLD_LIBRARY_PATH
-  PATH_SUFFIXES lib Lib cmake cmake/MOAB lib/cmake/MOAB 
+  PATH_SUFFIXES lib Lib lib64 cmake cmake/MOAB lib/cmake/MOAB lib64/cmake/MOAB
   NO_DEFAULT_PATH)
 
 if( MOAB_CMAKE_CONFIG STREQUAL "MOAB_CMAKE_CONFIG-NOTFOUND")
@@ -20,4 +20,4 @@ else()
   message(STATUS "Found MOAB in ${MOAB_CMAKE_CONFIG}")
   include(${MOAB_CMAKE_CONFIG}/MOABConfig.cmake)
   set(MOAB_FOUND FALSE)
-endif()
\ No newline at end of file
+endif()
diff --git a/cmake/FindOCE.cmake b/cmake/FindOCE.cmake
index 284081e..e8561f1 100644
--- a/cmake/FindOCE.cmake
+++ b/cmake/FindOCE.cmake
@@ -19,4 +19,5 @@ else()
   set(OCE_FOUND TRUE)
   message(STATUS "Found OCE in ${OCE_CMAKE_CONFIG}")
   include(${OCE_CMAKE_CONFIG}/OCEConfig.cmake)
+  add_definitions(-DOCE)
 endif()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5be84c0..19c5b25 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,30 +28,32 @@ ADD_LIBRARY(dagmc_topology dagmc_topology.cc)
 ADD_EXECUTABLE(dagmc_merge dagmc_merge.cc)
 TARGET_LINK_LIBRARIES(dagmc_merge dagmc_topology ${MOAB_LIBRARIES})
 
-# slcing library
-ADD_LIBRARY(dagmc_slicer dagmc_slicer.cc)
-TARGET_LINK_LIBRARIES(dagmc_slicer ${MOAB_LIBRARIES} ${CGAL_LIBRARIES} boost_system gmp)
-
-# dagmc slicer
-ADD_EXECUTABLE(dagmc_slice_tool dagmc_slice_tool.cc)
-TARGET_LINK_LIBRARIES(dagmc_slice_tool dagmc_slicer ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp)
-
-# dagmc 2d mesher
-ADD_EXECUTABLE(dagmc_2d_mesh dagmc_2d_mesh.cc)
-#ADD_DEFINITIONS(-DCGAL_USE_BASIC_VIEWER)
-TARGET_LINK_LIBRARIES(dagmc_2d_mesh dagmc_slicer vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp)
-
-# dagmc 3d mesher
-ADD_EXECUTABLE(dagmc_mesher dagmc_mesher.cc)
-TARGET_LINK_LIBRARIES(dagmc_mesher vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp mpfr)
-
-# dagmc_overlap
-ADD_EXECUTABLE(dagmc_overlap preper.cc)
-TARGET_LINK_LIBRARIES(dagmc_overlap vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp mpfr)
-
-INSTALL(TARGETS dagmc_slicer DESTINATION bin)
-INSTALL(TARGETS dagmc_merge DESTINATION bin)
-INSTALL(TARGETS dagmc_overlap DESTINATION bin)
-INSTALL(TARGETS dagmc_2d_mesh DESTINATION bin)
+IF(CGAL_FOUND)
+  # slcing library
+  ADD_LIBRARY(dagmc_slicer dagmc_slicer.cc)
+  TARGET_LINK_LIBRARIES(dagmc_slicer ${MOAB_LIBRARIES} ${CGAL_LIBRARIES} boost_system gmp)
+
+  # dagmc slicer
+  ADD_EXECUTABLE(dagmc_slice_tool dagmc_slice_tool.cc)
+  TARGET_LINK_LIBRARIES(dagmc_slice_tool dagmc_slicer ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp)
+
+  # dagmc 2d mesher
+  ADD_EXECUTABLE(dagmc_2d_mesh dagmc_2d_mesh.cc)
+  #ADD_DEFINITIONS(-DCGAL_USE_BASIC_VIEWER)
+  TARGET_LINK_LIBRARIES(dagmc_2d_mesh dagmc_slicer vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp)
+
+  # dagmc 3d mesher
+  ADD_EXECUTABLE(dagmc_mesher dagmc_mesher.cc)
+  TARGET_LINK_LIBRARIES(dagmc_mesher vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp mpfr)
+
+  # dagmc_overlap
+  ADD_EXECUTABLE(dagmc_overlap preper.cc)
+  TARGET_LINK_LIBRARIES(dagmc_overlap vertex_inserter ${MOAB_LIBRARIES} ${CGAL_LIBRARY} boost_system boost_program_options gmp mpfr)
+
+  INSTALL(TARGETS dagmc_slicer DESTINATION bin)
+  INSTALL(TARGETS dagmc_merge DESTINATION bin)
+  INSTALL(TARGETS dagmc_overlap DESTINATION bin)
+  INSTALL(TARGETS dagmc_2d_mesh DESTINATION bin)
+ENDIF()
 
 ADD_SUBDIRECTORY(test)