PdfMod is an application for modifying PDF. I used it to remove pages but we can re-order, rotate, etc.

install imagemagick sudo apt-get install imagemagick install pdfimages sudo apt-get install poppler-utils

Eigen3 is not detectable by CMake findpackage macro. One solution for this problem is to self-create a file FindEigen3.cmake that enables CMake to find Eigen3.see here.