libexttextcat-dev software package provides Language detection library - development files, 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 libexttextcat-dev
libexttextcat-dev is installed in your system.
Make ensure the libexttextcat-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libexttextcat-dev *
You will get with libexttextcat-dev package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Library development |
| Package | libexttextcat-dev |
| Version | 3.4.4-1+b1 [s390x], 3.4.4-1 [a |
| Description | Language detection library - development files |
| Sub Section | Libdevel |