Fix the poppler problem

README.md

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+gpdfx-ng - a graphical tool to extract parts of a PDF as a PDF
+===============================
+
+`gpdfx-ng` is a GTK application written in Python using the Poppler library
+to render the PDF. It uses pdfTeX and PDFCrop to create the extracted
+PDF.
+
+# Features
+My improvements to the ancient `gpdfx`:
+
+- Add a "Open" button (open file). 
+- Add a "Auto Fit" botton. It helps to fit the pdf file according to the size of the window.
+- Add a button "Viewport". It copies the "viewport" of the selected area to the clipboard. 
+- Add a status bar.
+
+# Install
+Dependency
+- Python2 or Python3
+- poppler-glib
+- python-gobject
+- gtk3
+- python-cairo
+
+The one line script `install.sh` helps to install (copy) `gpdfx-ng` to your PATH,
+in you want.
+
+# Usage
+- Run `gpdfx-ng` and open a pdf file. You can also pass a file name the through command line argument.
+- Select an area.
+- Export the selection to a pdf file, or copy the "viewport" to the clipboard.
+
+## Viewport
+If you want to insert the selected area of your pdf file in a LaTeX document, you may find the following codes useful.
+```
+  \begin{figure}[ht]
+    \includegraphics[clip, page=1, viewport=1 2 3 4,
+    width=1.0\textwidth, fbox]{paper.pdf}
+  \end{figure}
+```
+
+Upstream
+--------
+- https://github.com/lehner/gpdfx
+- Author: Christoph Lehner (clehner // users.sourceforge.net)

install.sh

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+#!/bin/bash 
+set -x
+sudo install -Dm 755 src/gpdfx-ng /usr/local/bin/gpdfx-ng