With today windows snapshot
(Lazarus-0.9.25-fpc-2.2.1-20080423-win32.exe) freshly installed (after uninstalling the previous one and renaming the remaining directory), trying to add a package (lazdaemon, but I suppose it doesn't matter), I have this problem rebuilding the ide. The usual causes (using a different fpc or a different/global fpc.cfg) don't seem to apply here.
C:\lazarus\components\daemon\reglazdaemon.pp(55,31) Hint: Parameter "AProject" not used
"Compiling package lazdaemon 0.9.9" completed
Recompiling InterfaceBase, checksum changed for Classes c:\lazarus\ide\lazarus.pp(1,1) Fatal: Can't find unit InterfaceBase used by Interfaces
Bye
