I have some documents using a same custom package. That "header" package loads by default the package fullpage. But I would like to write a new LaTeX document, using the same header, but without loading fullpage, and I don't want to change old files.

Is there a way to add an "if false" condition about options? I mean. I have currently:


But that implies to change all of my old documents to add the fullpage option to my package. I want however to make something like:

if-not-nofullpage {%

And in my new document:


Or perhaps a way to "unload" a previously loaded package:

\usepackage{fullpage} % inconditionally

\DeclareOption{nofullpage} {%

How can I do that? (if plain TeX macros are used in your answers, please, with little explanations).


You have to load fullpage after \ProcessOptions, first of all.

Here's the scheme:


\ExecuteOptions{fullpage} % default is fullpage



Then a document calling either




will load fullpage; a document calling



Thus you won't have to change your old document, but new ones will be able to avoid loading of fullpage.

  • Thanks egreg. What is the difference between \RequirePackage and \usepackage? I've read they are synonyms, but, really synonyms? Why two commands with same meaning? – Peregring-lk Sep 26 '13 at 18:08
  • 1
    @Peregring-lk In packages or classes \RequirePackage should be used. It's mostly a tradition, but having two separate command names can be used by the LaTeX developers for adding functionality to one of the commands without changing the meaning of the other. – egreg Sep 26 '13 at 18:19
  • Your solution works perfect. Elegant, direct and short. Thank you very much. – Peregring-lk Sep 26 '13 at 18:27
  • 1
    +1 - I took the liberty of taking your example and modifying it to use kvoptions – Tobias Kienzler Nov 20 '15 at 7:52

You can also use kvoptions:


\DeclareBoolOption[true]{fullpage}       % automatically creates \ifmypackage@fullpage
\DeclareComplementaryOption{nofullpage}{fullpage}  % automatically inverses the former


(based on egreg's example

See also the question on Mutually exclusive options in packages

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.