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Accessing the Gaudi external libraries is separate from downloading Gaudi itself. Again, the Gaudi Home Page does see reorganization from time to time, this information is current as of June,2006.
Access the Releases page off the Gaudi Home Page: http://proj-gaudi.web.cern.ch/proj-gaudi/releases/
Click on the Doxygen link for the version you are interested in.
The Doxygen page will include a link called "Related External Libraries"
For example for Gaudi v18r1: http://proj-gaudi.web.cern.ch/proj-gaudi/releases/v18r1/doxygen/externaldocs.html*Note the version of LCGCMT, in this case LCGCMT_40a.*
This page is helpful in that it provides the version of all Gaudi external, however, I have found that it does not necessarily provide useful links for obtaining the binaries for all platforms. I found the following link much more helpful in that all the binaries are available in one location:
http://service-spi.web.cern.ch/service-spi/external/distribution/
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set CMTCONFIG=win32_vc71_dbg
set SITEROOT=C:\heather
Update LCG_Settings/cmt/requirements:
set LCG_home=C:\heather
set LCG_releases - determines path to find POOL and SEAL
set LCG_external - determines path to find other externals like AIDA... haven't experimented with makeing LCG_external == LCG_releases
Update LCG_Interfaces/CLHEP/cmt/requirements
CLHEP_version - version number of CLHEP for Gaudi v18r1 it is 1.9.2.2
CLHEP_home - points to our CLHEP external example: $(GLAST_EXT)/CLHEP/$(CLHEP_native_version)
add python.exe to the PATH if it isn't already.