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the build and execution environment. This is very useful. For example, it allows packages built on a SuSE 8.2 system to run on a SuSE 8.1 system (this is because 8.2 has a newer glibc; packages built against it cannot be dynamically linked against older glibcs). Of course, Fix packages should not directly import glibc since that is very system-specific. Rather, they should import stdenv/stdenv.fix and in their build scripts source in $stdenv/setup, which will setup the right environment variables. The idea is that stdenv.fix provides the basic C/Unix build environment (C compiler, POSIX utilities, etc.). Note that only the ATerm package currently uses this. svn path=/nixpkgs/trunk/; revision=203