code: public void addEnv(final Environment.Variable var) {
      this.compilerDef.addEnv(var);
      for (int i = 0; i < this._compilers.size(); i++) {
        final CompilerDef currentCompilerDef = this._compilers.elementAt(i);
        currentCompilerDef.addEnv(var);
      }
      this.linkerDef.addEnv(var);
    }
docs: Add an environment variable to the launched process.