including GPL software info FreeBSD source tree

[Maksim Yevmenkin]

Hello,

what is the proper way to include GPL source code into FreeBSD distribution?
i have a source code (from Linux) that is under GPL. i would like hack it a
little bit and include it into FreeBSD distribution.

should i

1) keep GPL license?
2) put BSD license on top and keep GPL?
3) substitute GPL with BSD license?

do i have to contact the author of the Linux code and get his permission?

thanks,
max

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