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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.htmlNote 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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In addition to downloading the libraries, also download the appropriate version of LCGCMT_, this package acts as their IExternal package and is necessary to compile Gaudi.*
Compilation
Unpack all the source and binaries you have downloaded.
Gaudi uses CMT, so building goes something like this:
cmt config
make (nmake /f nmake)