This appendix contains descriptions of all of the construction variables that are potentially available "out of the box" in this version of SCons. Whether or not setting a construction variable in a construction environment will actually have an effect depends on whether any of the Tools and/or Builders that use the variable have been included in the construction environment. In this appendix, we have appended the initial $ (dollar sign) to the beginning of each variable name when it appears in the text, but left off the dollar sign in the left-hand column where the name appears for each entry. &variables-gen;