This is original deskew plug-in for GIMP written by Karl Chen back in 2007. 
The plugin's homepage has been offline for a very long time, and the 
plug-in needed some fixes. So I went ahead and saved it from 
http://ccux-linux.de/pdb/index.php?pdetail=6271 where an src.rpm still had the 
original tarball.

Below goes slightly adjusted original contents of README.

GIMP Deskew Plug-In
===================

Copyright (C) 2007 Karl Chen <[email protected]>

http://www.cubewano.org/gimp-deskew-plugin/

Distributed under GPL v2+ (see COPYING).

Uses Radon skew detection algorithm and code from the PageTools project
(http://sourceforge.net/projects/pagetools).  [email protected],
[email protected].


Usage
=====

Click Layer => Transform => Deskew.

Gimp will auto-straighten ("deskew") the image.


Installation
============

Building/installation procedure depends on where you got the source code from.

If you got source code from Git repository,

	./autogen.sh
	make
	make install

If you got a tarball with a version,

	./configure
	make
	make install

For both ./autogen.sh and ./configure you can use --prefix=INSTALL_PATH, where 
a typical installation path is /usr. By default /usr/local is used.