Compile FreeBSD RELENG_5 on FreeBSD 4-STABLE

[Brovo Karokin]

Hi.
I have a FreeBSD 4-STABLE machine.
I want to do my custom RENELG_5 FreeBSD release.
I'm get all RELENG_5 CVS source (with cvs checkout -rRELENG_5 src)
So can I compile RELENG_5 kernel and sources im a 4-STABLE enviroment?

Brovo.