# Cannot compile Slicer on Mac - macOS Sierra + clang 9 + cmake 3.9.1

**URL:** <https://discourse.slicer.org/t/cannot-compile-slicer-on-mac-macos-sierra-clang-9-cmake-3-9-1/1104>\
**Category:** Development\
**Tags:** build\
**Created:** [September 22, 2017, 6:27pm UTC](https://discourse.slicer.org/t/cannot-compile-slicer-on-mac-macos-sierra-clang-9-cmake-3-9-1/1104 "2017-09-22T18:27:59Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [September 22, 2017, 7:22pm UTC](https://discourse.slicer.org/t/cannot-compile-slicer-on-mac-macos-sierra-clang-9-cmake-3-9-1/1104/3 "2017-09-22T19:22:31Z")

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@blowekamp I confirm I have that entry:

```nohighlight
$ grep SITK_CHECK_CXX11 CMakeCache.txt
SITK_CHECK_CXX11:INTERNAL=FALSE

```

But @jcfr confirmed recently c++11 is not currently supported in Slicer: [Transition to VTK 8.0](https://discourse.slicer.org/t/transition-to-vtk-8-0/379/4)

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