Install libnemo-extension-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libnemo-extension-dev
Nemo component system facilities (development files)
Nemo is the official file manager for the Cinnamon desktop. It allows one to browse directories, preview files and launch applications associated with them. It is also responsible for handling the icons on the Cinnamon desktop. It works on local and remote filesystems. . This package contains the files needed to compile and link nemo extensions.