building a single block

[Geoff Howard]

Some time ago the call-block-target was added to support building a 
single block by itself.  I can't find enough info on how to use this in 
the archives or wiki.  I did find:

build -Dblock.name=jms -Dtarget.name=lib call-block-target

which calls cocoon-block-jms-lib for example.  But I can't see a way as 
things stand to call all targets needed to rebuild a block by itself.  I 
tried using compile and then lib as target.name, but this didn't seem to 
be all I needed.  Does anyone who uses this have tips?

Geoff