No power interface in libstageplugin??

Dear all,
I am trying to use the power interface on a Stage-based simulation, but
after I run player (with libstageplugin), I get this error:
symbol lookup error: /usr/local/lib/libstageplugin.so.1: undefined symbol:
_ZN14InterfacePowerC1E14player_devaddrP9StgDriverP10ConfigFilei

that means that the dynamic linker is not able to find the symbol
InterfacePower::InterfacePower(player_devaddr, StgDriver*, ConfigFile*, int)

is this implemented? actually, it seems so, reading this webpage:
http://playerstage.sourceforge.net/doc/stage-2.0.0/group__player.html

this is my .cfg file
driver
(
  name "stage"
  plugin "libstageplugin"
  worldfile "ssi-office.world"
)

driver
(
  name "stage"
  provides [ "position2d:0" "laser:0" "power:0" ]
  model "robot1"
)



-- 
Daniele "MadMage" Calisi
"Your limit is always a bit beyond"

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