To generate a new base_dependency_database:

setup the environment for mrb
mkdir <some_working_dir>
cd <some_working_dir>
mrb newDev -v <version> -q <quals>
source localProductsXXX/setup
cd srcs
mrb g [-t <version>] larsoft_suite
cd $MRB_BUILDDIR
mrbsetenv
mrb b [-jN]
mrb md
cp .dependency_database  $MRB_SOURCE/larsoft/releaseDB/base_dependency_database