\documentclass[letter,12pt,twoside]{article}
\usepackage[english]{babel}
\include{setup}
\include{setup-builddir} % load \def\builddir{}

\def\tIngredients{Ingredients}
\def\tRecipe{recipe}
\def\tPagePrefix{p.}

\begin{document}
\makefrontmatter
\graphicspath{{\builddir/en/}}
\include{\builddir/en/pdf-export}
\end{document}