portmaster versus portsclean

[Warren Block]

After switching to portmaster, portsclean is the last part of 
portupgrade I'm using.

portsclean -C can be replaced with 'rm /usr/ports/*/*/work', or better 
with 'find -X /usr/ports/ -name work -depth 3 -exec rm -rf {} \;'.
I don't see a way to do this with portmaster, but it's trivial.

portsclean -D can be replaced with 'portmaster -t --clean-distfiles'. 
portsclean -DD can be replaced with 'portmaster --clean-distfiles'. 
(Those might be backwards, the wording in the portmaster man page is a 
little ambiguous.)

Is there an equivalent for portsclean -L, to delete "old, duplicated, or 
orphaned shared libraries" in a batch?