diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b802c4c..a6d84ac1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,9 @@ endif()
 if (POLICY CMP0054)
   cmake_policy(SET CMP0054 OLD)
 endif()
+if (POLICY CMP0025) # Compiler ID when using clang set to clang not appleclang
+  cmake_policy(SET CMP0025 OLD)
+endif()
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
@@ -83,6 +86,10 @@ include(SimVascularFunctionCheckCompilerFlags)
 #-----------------------------------------------------------------------------
 # Externals!
 set(SV_EXTERNALS_ADDITIONAL_CMAKE_ARGS "" CACHE STRING "If more options want to be provided to the sv_externals build, they can be with this string")
+set(SV_EXTERNALS_APPLE_CMAKE_ARGS)
+if(APPLE AND NOT SV_PLATFORM_VERSION_DIR VERSION_EQUAL 10.11)
+  list(APPEND SV_EXTERNALS_APPLE_CMAKE_ARGS -DSV_EXTERNALS_VTK_VERSION:STRING=7.0.0)
+endif()
 ExternalProject_Add(Externals
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/Externals
   BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/Externals-build
@@ -98,6 +105,7 @@ ExternalProject_Add(Externals
     -DCMAKE_MACOSX_RPATH:BOOL=ON
     -DBUILD_TESTING:BOOL=OFF
     -DBUILD_EXAMPLES:BOOL=OFF
+    ${SV_EXTERNALS_APPLE_CMAKE_ARGS}
     ${SV_EXTERNALS_ADDITIONAL_CMAKE_ARGS}
     )
 set(SV_EXTERNALS_TOPLEVEL_DIR "${CMAKE_BINARY_DIR}/Externals-build/sv_externals")
@@ -106,6 +114,10 @@ set(SV_EXTERNALS_TOPLEVEL_DIR "${CMAKE_BINARY_DIR}/Externals-build/sv_externals"
 #-----------------------------------------------------------------------------
 # svSolver!
 set(SV_ADDITIONAL_CMAKE_ARGS "" CACHE STRING "If more options want to be provided to the sv_externals build, they can be with this string")
+set(SV_APPLE_CMAKE_ARGS)
+if(APPLE AND NOT SV_PLATFORM_VERSION_DIR VERSION_EQUAL 10.11)
+  list(APPEND SV_APPLE_CMAKE_ARGS -DVTK_VERSION:STRING=7.0.0)
+endif()
 ExternalProject_Add(svSolver
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/Code
   BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/svSolver-build
@@ -125,6 +137,7 @@ ExternalProject_Add(svSolver
     -DBUILD_SHARED_LIBS:BOOL=OFF
     -DSV_EXTERNALS_USE_TOPLEVEL_DIR:BOOL=ON
     -DSV_EXTERNALS_TOPLEVEL_DIR:PATH=${SV_EXTERNALS_TOPLEVEL_DIR}
+    ${SV_APPLE_CMAKE_ARGS}
     ${SV_ADDITIONAL_CMAKE_ARGS}
     )
 #-----------------------------------------------------------------------------
diff --git a/Code/CMakeLists.txt b/Code/CMakeLists.txt
index 8f19458c..e54b2130 100644
--- a/Code/CMakeLists.txt
+++ b/Code/CMakeLists.txt
@@ -24,6 +24,7 @@
 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#-----------------------------------------------------------------------------
 cmake_minimum_required(VERSION 3.3.0)
 
 if (POLICY CMP0040)
@@ -38,6 +39,10 @@ endif()
 if (POLICY CMP0054)
   cmake_policy(SET CMP0054 OLD)
 endif()
+if (POLICY CMP0025) # Compiler ID when using clang set to clang not appleclang
+  cmake_policy(SET CMP0025 OLD)
+endif()
+#-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 Project(SV)
diff --git a/Externals/CMakeExternals/SvExtOptions.cmake b/Externals/CMakeExternals/SvExtOptions.cmake
index 9ad4d8aa..a6ef0769 100644
--- a/Externals/CMakeExternals/SvExtOptions.cmake
+++ b/Externals/CMakeExternals/SvExtOptions.cmake
@@ -63,9 +63,5 @@ mark_as_advanced(SV_EXTERNALS_GIT_URL)
 # and optional install dirname. Order matters; put independent packages first
 #-----------------------------------------------------------------------------
 # VTK
-if(APPLE)
-  sv_externals_add_new_external(VTK 7.0.0 ON OFF vtk vtk)
-else()
-  sv_externals_add_new_external(VTK 6.2.0 ON OFF vtk vtk)
-endif()
+sv_externals_add_new_external(VTK 6.2.0 ON OFF vtk vtk)
 #-----------------------------------------------------------------------------
diff --git a/Externals/CMakeLists.txt b/Externals/CMakeLists.txt
index e28eb44d..555b4f15 100644
--- a/Externals/CMakeLists.txt
+++ b/Externals/CMakeLists.txt
@@ -49,6 +49,9 @@ endif()
 if (POLICY CMP0054)
   cmake_policy(SET CMP0054 OLD)
 endif()
+if (POLICY CMP0025) # Compiler ID when using clang set to clang not appleclang
+  cmake_policy(SET CMP0025 OLD)
+endif()
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------