AppImage

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AppImages are portable software that do not require root permission to be run. They can be run without root permission:

user $chmod +x ExamplePackage.AppImage
user $./ExamplePackage.AppImage

Dependency

Most AppImages require sys-fs/fuse on slot 0:

user $./ExamplePackage.AppImage
dlopen(): error loading libfuse.so.2

AppImages require FUSE to run. 
You might still be able to extract the contents of this AppImage 
if you run it with the --appimage-extract option. 

See https://github.com/AppImage/AppImageKit/wiki/FUSE for more information

This error can be solved by installing sys-fs/fuse in slot 0. Slot 0 has version 2 of fuse required by most AppImages. Whereas sys-fs/fuse in slot 3 which has version 3 of fuse. The highest version available is installed by default, currently in slot 3, if no slot is specified and doesn't solve the dependency problem.

root #emerge --ask sys-fs/fuse:0

References