You'll need the following dependencies:

• libdbus-1-dev
• libgee-0.8-dev
• libglib2.0-dev
• meson
• valac

Run meson to configure the build environment and then ninja to build

meson build --prefix=/usr
cd build
ninja

To install, use ninja install

sudo ninja install

elementary Files, Photos and other apps support adding options to the context menu by the way of Contract files.

These Contract files can be made system wide available by adding them to: /usr/share/contractor or for specific users by adding them to: ~/.local/share/contractor

Simple .contract file example:

[Contractor Entry]
Name=Mount
MimeType=application/x-cd-image;application/x-raw-disk-image
Exec=gnome-disk-image-mounter %f

• Name: Text displayed in the right click context menu.
• MimeType: Mimetype(s) of files it should be shown for.
• Exec: Command to execute. More info.

Tips:

• Use pkexec to ask for root permissions. Example: Exec=pkexec chmod +x %U

• Send by Email
• Print
• Send files via Bluetooth
• Compress
• Extract Here
• Write onto removable device
• QR Share
• Wallpaperize
• Show checksum
• GPG Encrypt/Decrypt