if ! kpsewhich -format=fmt mex > /dev/null && \
! pdfmex --version > /dev/null 2> /dev/null; then \
echo "No mex format found."; false; \
fi
if ! kpsewhich -format=fmt mex > /dev/null && \
! pdfmex --version > /dev/null 2> /dev/null; then \
echo "No mex format found."; false; \
fi