These directories come into play when the software product is supported on multiple platforms. When such is the case, ``bin/flavor/'' would serve to consolidate all executables for a given platform, while ``lib/flavor/'' would play a similar role for user-visible libraries. The directory is actually given a name that is a concatenation of the flavor and version of the operating system, for example IRIX5 instead of IRIX. This name (e.g. IRIX5) is stored in the environmental variable $SRT_ARCH.