ede-linux build directory

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Hi,

I build my linux kernel on a different directory, i.e. not in the same
directory with the source tree, when I open file with emacs and with

(global-ede-mode t)

every time I try to open a file from the linux source tree, it always
ask me to set the linux build directory.

I try to use

(setq project-linux-build-directory-default
"/home/user/workspace/linux-build/")

this way, it always fails with error:

"eieio-validate-slot-value: Invalid slot type: ede-linux-project,
build-directory, string, nil"

Is there any way to set the linux build directory in my init.el file,
so that I don't have to select the directory every time?

Thanks!
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