version – Conditionally include text

De­fines macros \in­clude­ver­sion{NAME} and \ex­clude­ver­sion{NAME}, each of which de­fines an en­vi­ron­ment NAME whose text is to be in­cluded or ex­cluded from com­pi­la­tion.
Although the com­mand syn­tax is very sim­i­lar to that of com­ment, com­ment.sty is to be pre­ferred to ver­sion.sty for doc­u­ments where sig­nif­i­cant chunks of text may be ex­cluded.