[build2] How: build specific compilaton - out of source

[hjansen.iv]

In the same directory I have

myproj/
myproj-gcc-dbg/
myproj-gcc-rel/

where the last two dirs are development and release build configurations. In the myproj root directory I can do:
`bdep update @gcc-dbg` and `bdep update @gcc-rel`
How do I specify `-g` and `-O3` conditional compilation flags for `dbg` and `rel` versions respectively?

Thanks,
-- Henk

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