libgadu-dev software package provides Gadu-Gadu protocol library - development files, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgadu-dev
libgadu-dev is installed in your system.
Make ensure the libgadu-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgadu-dev *
You will get with libgadu-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Library development |
| Package | libgadu-dev |
| Version | 1:1.11.2-1+deb7u2 |
| Description | Gadu-Gadu protocol library - development files |
| Sub Section | libdevel |