:src for master sites

[Dan Langille]

Hi folks,

FreshPorts uses "make master-sites-all" to extract the list of master 
sites for a port.

I recently learned about "make master-sites-src" which is used for  
lang/spidermonkey.

I'm told that :src is a group.  This raises a number of questions 
with respect to master sites and FreshPorts.  In short: how can I 
determine which groups, if any, to use and when?

thank you

-- 
Dan Langille : Software Developer looking for work
my resume: http://www.freebsddiary.org/dan_langille.php