How are Delphi 'environment variables' such as $(BDS) evaluated?

Question

I\'m making some tidy installers for our internal libraries (instead of just opening the DPK\'s and clicking \'install\' and getting in a mess later...) and this has caused

Answer 1

The $() notation for variables is a convention used by MAKE, what Borland used as build tool before switching to MSBuild. (in D2007?)