Ignored VCS files under specified directory

I see the documentation about that, and here but it's not clear how to specify the case like this:

/project_root/some/path/1/build/debug/*

/project_root/some/path/1/build/release/*

...

/project_root/some/path/1/another/path/1/build/debug/*

/project_root/some/path/1/another/path/1/build/release/*

you see that build folder exists in different places and on different hierarchy levels.

I'd like to write something under "ignore all files under": */build

but it doesn't work for me 

what is a correct form for such case?