求助 ，编译问题

[feng123]

我用的是eps-idf-v3.1.3, 在ubuntu下按教程搭好编译环境，编译hello例程，执行idf.py menuconfig,出现如下信息

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1. Running cmake in directory /home/esp/esp-idf-v3.1.3/examples/get-started/hello_world/build
2. Executing "cmake -G Ninja --warn-uninitialized /home/esp/esp-idf-v3.1.3/examples/get-started/hello_world"...
3. CMake Error: Could not create named generator Ninja
4. Warn about uninitialized values.
5. cmake failed with exit code 1
6.  

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不知何解，求教大神。