libcomposereditorng4 software package provides compose editor library, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libcomposereditorng4
libcomposereditorng4 is installed in your system.
Make ensure the libcomposereditorng4 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libcomposereditorng4 *
You will get with libcomposereditorng4 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | libcomposereditorng4 |
| Version | 4:4.14.1-1 |
| Description | compose editor library |
| Sub Section | libs |