updating alpine port to new version (as a maintainer)

[Marco Beishuizen]

Hi,

I am the port maintainer of the alpine port, nevertheless not a very 
experienced one.

The alpine mailer has recently been updated from 2.11 to 2.20 and I as a 
maintainer would like to update the port to the new version.

According to the porter's handbook I have to use diff to create a patch in 
order to upgrade the alpine port. Is this correct? I'm hoping to get some 
pointers from an experienced port maintainer how to deal with upgrades 
like this.

Thanks in advance for your help.

Regards,

Marco