user plugin search path
According to https://wiki.gnome.org/Apps/EyeOfGnome/Plugins, the user plugin search path should be $HOME/.local/share/eog/plugins. If I install the eog-plugins using this path (./autogen.sh --prefix=$HOME/.local/share/eog/plugins) then the resulting layout will look like
$ tree -L 4 $HOME/.local/share/eog/plugins
/home/christian/.local/share/eog/plugins
├── lib
│ └── eog
│ └── plugins
│ ├── exif-display.plugin
│ ├── export-to-folder.plugin
│ ├── export-to-folder.py
│ ├── fit-to-width.plugin
│ ├── fullscreenbg.plugin
│ ├── fullscreenbg.py
│ ├── libexif-display.la
│ ├── libexif-display.so
│ ├── libfit-to-width.la
│ ├── libfit-to-width.so
│ ├── liblight-theme.la
│ ├── liblight-theme.so
│ ├── libsend-by-mail.la
│ ├── libsend-by-mail.so
│ ├── light-theme.plugin
│ ├── maximize-windows.plugin
│ ├── maximize-windows.py
│ ├── __pycache__
│ ├── pythonconsole
│ ├── pythonconsole.plugin
│ ├── send-by-mail.plugin
│ ├── slideshowshuffle.plugin
│ └── slideshowshuffle.py
└── share
├── appdata
│ ├── eog-exif-display.metainfo.xml
│ ├── eog-export-to-folder.metainfo.xml
│ ├── eog-fit-to-width.metainfo.xml
│ ├── eog-fullscreenbg.metainfo.xml
│ ├── eog-light-theme.metainfo.xml
│ ├── eog-maximize-windows.metainfo.xml
│ ├── eog-pythonconsole.metainfo.xml
│ ├── eog-send-by-mail.metainfo.xml
│ └── eog-slideshowshuffle.metainfo.xml
├── eog
│ └── plugins
│ ├── export-to-folder
│ ├── fullscreenbg
│ └── pythonconsole
├── glib-2.0
│ └── schemas
│ ├── gschemas.compiled
│ ├── org.gnome.eog.plugins.exif-display.gschema.xml
│ ├── org.gnome.eog.plugins.export-to-folder.gschema.xml
│ ├── org.gnome.eog.plugins.fullscreenbg.gschema.xml
│ └── org.gnome.eog.plugins.pythonconsole.gschema.xml
└── localeand eog will not be able to find those plugins.