what can i delete from /usr

[goose bla]

hello,,

please. i have not big hdd,, and i need to make free place. what can i
remove from /usr  and system will be OK ? 

example:

/usr/ports/distfiles/   - i can remove all files.

in /usr/ports i can do 
rm -rf \*/work/

i can remove 
/usr/src/sys/i386/compile/*    after reboot with new kernel.

can i remove /usr/src/sys/amd64 or /alpha  if a have i386 platform ?


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