Applying arch specific patch to package from feeds

[Nishant Sharma]

Hello,

How can I apply a patch to a package from the feed, only when the 
architecture is say, ramips but not when it is x86_64 or mips.

If I put the patch in package's patch directory, it gets applied 
unconditionally.

Thanks in advance for the pointers.

Regards,
Nishant