Conditional compilation in a LaTeX document

Question

I want to generalize the template that I have, and one of the elements sets several variables before creating a PDF file for sending to someone.

In my Makefile, I installed:

${OBJS}/main.pdf: main.tex ${DEPS}
 pdflatex -output-directory=${OBJS} "\def\recipiant{${RECIPIANT}} \def\revision{${REVISION}} \include{main}"

Although I would like to not worry about these variables for reviews .. I decided that I can do something like \ ifdef, but it does not work ... any ideas how I can generalize this template conditionally?

\ifdef\recipiant
                \fancyfoot[CE,CO]{prepared for \recipiant \ (revision \revision) }
\else
                \fancyfoot[CE,CO]{REVIEW}
\fi

Answer 1

I use \ifxto achieve this

\ifx\recipiant\undefined
    \fancyfoot[CE,CO]{REVIEW}
\else
    \fancyfoot[CE,CO]{prepared for \recipiant \ (revision \revision) }
\fi