[yocto] Can I change the value of D in a task?

[윤영석]

Hi, 
 
I want to change the value of D in tasks, like do_install, do_compile ...
- It is useless to change outside.
 
What should I do?
 
I tried the following but it did not work.
1.
do_install () {
    D = "<path>"
}
 
2.
do_install () {
    export D = "<path>"
}
 
Thanks
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