In a LaTeX document, conditions regarding the compilation of specific portions of the text could be included
The \ifthenelse instruction provided by the ifthen package is a
solution to deal with conditions but it is quite sensitive and does not
handle the verbatim environment nor the \verb command.
Getting back to the genuine Tex commands appears a more robust solution.
Exemple :
% define a condition
\newif\ifmycondition
\myconditiontrue
% define mycondition as true
% \myconditionfalse
% define mycondition as false
\ifmycondition
% if mycondition is true print this :
hello my condition is true
\else
% if mycondition is false print this :
hello my condition is false
\fi
There is not need to load/install any special package.