CMT v1r20p20090520 available on SLAC Linux on /afs/slac/g/glast/users/heather/gaudi_v21r4/CMT and through the download section of the CMT web site.
Source Code modified for GLAST to limit the externals required by Gaudi
LCGCMT_56c zip file of externals and interface CMT packages for Gaudi
An updated version of ROOT v5.22.00e-gl1, the binaries are available in GLAST_EXT at SLAC and the source is in compiled against gccxml 0.9

Copy in our version of ROOT v5.22.00e-gl1 in the external/ROOT directory
Update external/LCGCMT_56c/LCG_Configuration/cmt/requirements and set ROOT_config_version to 5.22.00e-gl1
Update external/LCGCMT/LCGCMT_56c/LCG_Interfaces/ROOT/cmt/requirements and comment out
## apply_pattern use_optional pkg=Qt
## apply_pattern use_optional pkg=dcache_client
## apply_pattern use_optional pkg=gfal
and add:
macro ROOT_cppflags "" \
target-winxp "-DROOT_w32pragma "
Update external/LCGCMT/LCGCMT_56c/LCG_Settings/cmt/requirements
Update LCG_home to the top level location of the Gaudi build to something like:
macro LCG_home "${myPathDir}/buildingGaudi_v21r4/"
Set up to use CMT v1r20p20090520
CMTBIN
CMTVERSION
CMTROOT
CMTPATH
SITEROOT
Gaudi uses CMT, so building goes something like this
We choose to limit the Gaudi packages we build to: GaudiKernel, GaudiSvc, GaudiUtil, GaudiAlg, GaudiAud
cmt broadcast "cmt config"
source setup.sh
make

Building Gaudi v18r1

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