It's recommended to create a clean build environment

mkdir build
cd build/

Run cmake to configure the build environment and then make to build

cmake -DCMAKE_INSTALL_PREFIX=/usr ..
make

To install, use make install

sudo make 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