ros2 rttest example build error

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hi, i try to use https://github.com/ros2/rttest , but when i want to build the examples, it returns errors when running make:

rttest/build/include/rttest/rttest.h:29:21: error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token
   size_t iterations = 0,
                     ^

and some other lines with the same style of error ? in rttest.h is a struct, with the first entry with the line of above error ?

including stddef.h or changing size_t to unsigned int, doesnt change anything from the style of error ?

thanks for help flo