using env vars on %attr macro

["Mccabe, Julie [CIB-IT]" <julie mccabe citigroup com>]

Hello,

in the %files section of the spec file, is the following allowed:

%attr(<perm>, $SOME_USER, $SOME_GROUP) <file>

that is can the attr macro refer to user and group set in the env rather than specifying the 'actual' user in the spec? - could not find any documentation listing this as possible.

Regards,
Julie.