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@@ -5,8 +5,15 @@ set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_CXX_EXTENSIONS OFF)
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-set(CMAKE_C_STANDARD 17)
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-set(CMAKE_C_STANDARD_REQUIRED ON)
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+# CMake < 3.21 only goes up to 11, but it's mostly identical to 17 anyway.
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+if(${CMAKE_VERSION} VERSION_LESS "3.21.0")
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+ set(CMAKE_C_STANDARD 11)
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+ set(CMAKE_C_STANDARD_REQUIRED ON)
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+else()
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+ set(CMAKE_C_STANDARD 17)
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+ set(CMAKE_C_STANDARD_REQUIRED ON)
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+endif()
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+
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# TODO/FIXME: Investigate disabling C extensions on Linux/POSIX
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if(OS_MACOS OR NOT OS_POSIX)
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set(CMAKE_C_EXTENSIONS OFF)
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derrod