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/usr/share/cmake-3.10/Modules/Compiler/AppleClang-C.cmake is in cmake-data 3.10.2-1ubuntu2.

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include(Compiler/Clang)
__compiler_clang(C)

if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.0)
  set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")

  set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")

  set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
endif()

__compiler_check_default_language_standard(C 4.0 99)