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For instance, don't attempt to install TerraGear dependencies unless TERRAGEAR is in WHATTOBUILD. This should significantly reduce the number of packages downloaded by the first use of download_and_compile.sh that doesn't have -pn in the options. We may get reports of missing dependencies for some components as a side effect of this change; we'll just have to add the missing dependencies wherever they are required (this can happen if, for instance, some particular dependency was so far listed in the comments only as a TERRAGEAR dependency, but was actually required by *another component* such as FGFS). Incorrect dependency information needs to be fixed, that's all there is to it.