Source Code Tarballs (see below for package options)
 
The following tar files contain a source program (C++), a build script (Make), 
and a user guide or man page. The installation procedure is explained below.
dkopp-6.9.tar.gz
Apr 01 2016
findwild-2.2.tar.gz Jan 03 2016
fotoxx-17.04.2.tar.gz
May 02 2017
fotoxx-maps-1.1.tar.gz Dec 01 2014  optional map files
galaxy2-1.3.tar.gz Apr 11 2017
lbench-3.4.tar.gz Apr 11 2017
mystuff-2.9.tar.gz May 28 2016
picpuz-2.8.tar.gz Apr 01 2017
sortpuz-1.5.tar.gz Apr 01 2017
ukopp-6.3.tar.gz Apr 03 2017
watsup-3.7.tar.gz Apr 01 2017
zfuncstest-6.6.tar.gz
Apr 11 2017

Dependencies:
The following packages are needed to build and install these programs: 
    libc6, xdg-utils,  g++,  libgtk-3.0-dev,  binutils

Fotoxx also needs: 
    libtiff5-dev,  libpng-dev, liblcms2-dev, libimage-exiftool-perl, leafpad,
    libraw-dev, libclutter-1.0-dev, libchamplain-0.12-dev, libchamplain-gtk-0.12-dev

RPM names are different:
    For Fedora, Suse, and others using RPM, you will need to find the corresponding
    packages, which have different names from the above Debian/Ubuntu names.
  
Installation Procedure:
  0.  Install the above dependencies using your package manager.
  1.  Download the tar file (appname-xxx.tar.gz)
  2.  Open a terminal window and enter the following commands:
  3.  $ cd Downloads                       # go to the tar file
  4.  $ tar -xzf appname-xxx.tar.gz        # unpack the tar file
  5.  $ cd appname                         # go to unpacked files
  6.  $ make                               # build executable
  7.  $ sudo make install                  # install executable

Missing dependencies will cause error messages in step 6. 
Install these using your package manager and repeat step 6.
Step 7 installs program files at  /usr/bin, /usr/share/appname, /usr/share/doc/appname

Uninstall appname:
  $ sudo rm -f /usr/bin/appname  
  $ sudo rm -R -f /usr/share/appname
  $ sudo rm -R -f /usr/share/doc/appname
  $ rm -R -f /home/<user>/.appname
 
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Debian Packages
 
A package may be available in your Linux repositories (and may be quite old).
The newest versions are here. They might install on your flavor of Linux.
If this fails, you can build from source code, as described below.
 
Use the following commands to remove the old package (if any) and install the new one. 
  $: sudo dpkg -r appname                       ## remove the old package
  $: sudo dpkg -i appname-NN.N-x86_64.deb       ## install the new package
 
Packages built with Ubuntu 16.04 
dkopp-6.9-x86_64.deb
Apr 01 2016
findwild-2.2-x86_64.deb Jan 03 2016
fotoxx-17.04.2-x86_64.deb
May 02 2017
fotoxx-maps-1.1-x86_64.deb Dec 01 2014  optional map files
galaxy2-1.3-x86_64.deb Apr 11 2017
lbench-3.4-x86_64.deb Apr 11 2017
mystuff-2.9-x86_64.deb May 28 2016
picpuz-2.8-x86_64.deb Apr 01 2017
sortpuz-1.5-x86_64.deb Apr 01 2017
ukopp-6.3-x86_64.deb Apr 03 2017
watsup-3.7-x86_64.deb Apr 01 2017
 
Packages built with Ubuntu 16.10
dkopp-6.9-x86_64.deb
Apr 01 2016
findwild-2.2-x86_64.deb Jan 03 2016
fotoxx-17.04.2-x86_64.deb May 02 2017
fotoxx-maps-1.1-x86_64.deb Dec 01 2014  optional map files
galaxy2-1.3-x86_64.deb Apr 11 2017
lbench-3.4-x86_64.deb Apr 11 2017
mystuff-2.9-x86_64.deb May 28 2016
picpuz-2.8-x86_64.deb Apr 01 2017
sortpuz-1.5-x86_64.deb Apr 01 2017
ukopp-6.3-x86_64.deb Apr 03 2017
watsup-3.7-x86_64.deb Apr 01 2017
 
Packages built with Ubuntu 17.04
dkopp-6.9-x86_64.deb
Apr 01 2016
findwild-2.2-x86_64.deb Jan 03 2016
fotoxx-17.04.2-x86_64.deb May 02 2017
fotoxx-maps-1.1-x86_64.deb Dec 01 2014  optional map files
galaxy2-1.3-x86_64.deb Apr 11 2017
lbench-3.4-x86_64.deb Apr 11 2017
mystuff-2.9-x86_64.deb May 28 2016
picpuz-2.8-x86_64.deb Apr 01 2017
sortpuz-1.5-x86_64.deb Apr 01 2017
ukopp-6.3-x86_64.deb Apr 03 2017
watsup-3.7-x86_64.deb Apr 01 2017
 
 
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AppImage package for Fotoxx

 
AppImage is a packaging format that is "distro agnostic" (read about AppImage).
It has been tested on Ubuntu 16.04, 16.10, 17.04, Mint 18.1, and Fedora 25.
The file size is 30 megabytes. It is only available for 64-bit Linux.
 
Installation Instructions:
A 'fotoxx.desktop' file is installed at:  /home/<user>/.local/share/applications
If you want to remove Fotoxx, use the Fotoxx menu: Tools > Uninstall AppImage.

I would appreciate knowing which Linux flavors work and which do not (contact).