How to specify in cmake which c/c++ standard the compiler should use?

Question

C++ / C#

On my system, by default, C code is compiled in accordance with C89 (gcc), but the pow function appeared only in C99. Therefore, I need to build programs with this standard. The problem is easily solved in qmake with one line:
CONFIG += C99
But I would like to know how this is done in cmake?

Answer 1

Something like
or
?
From here