The source code tarball for the latest stable release (currently 0.7.2) can be downloaded here.
The latest development code can be found on GitHub: https://github.com/carlobaldassi/gimp-lqr-plugin.
Compile and install, short description
This section is intended for those who are familiar with compilig from source. If you're not, read the next section.
Compilation follows the well known configure && make && sudo make install pattern. You'll need the GIMP headers (version 2.8 or later), the Liquid Rescale Library (version 0.4.1 or later) and everything else which configure complains about ;)
Remember to sudo make uninstall before upgrading.
Compile and install, full description
The following instructions assume you're running GNU/Linux, but they should probably work without too much trouble on other *nix variants as well, such as Mac OSX or BSD variants.1.
Note: when upgrading to a new version, always uninstall the previous version first.
First of all, you have to make sure to satisfy all the dependencies. The most important ones are the GIMP headers (version 2.8 or later), gettext, intltool, and the Liquid Rescale Library (liblqr1) (version 0.4.1 or later).
Most required packages should be available through your own distribution; if you can't find a sufficiently up-to-date version of the liblqr1 library, you can download it from here.
Make sure you also get the liblqr1 library headers, as well (either install it from source or download the packages with the suffix “-dev”, or “-devel” or similar).
(Of course, you will also need the compilation tools, in Ubuntu these are included in the build-essential package.)
Extract, compile and install
When you have installed all the other required packages, open a terminal, enter into the directory where you downloaded the plugin, then issue these commands:
tar -vxjf gimp-lqr-plugin_0.7.2.tar.bz2 cd gimp-lqr-plugin_0.7.2 ./configure
If the last step does not finish correctly, you probably didn't satisfy all the dependencies. Inspect the error message you're given, install the required software and run ./configure again.
If you're installing a different version then 0.7.2, just substitute the correct version number in all of the above commands.
If the configure step is successful, type:
to compile the plugin, and:
sudo make install
to install it. This last step requires that you have administrative privileges on your computer.
That's all. If everything went right, you will find the plugin under the Layer menu the next time you restart GIMP.
To uninstall, just open a terminal, cd into the plugin directory and give this command:
sudo make uninstall