gmfsk software package provides MFSK, RTTY and other digital mode terminal for HF/amateur radio, 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 gmfsk
gmfsk is installed in your system.
Make ensure the gmfsk package were installed using the commands given below,
$ sudo dpkg-query -l | grep gmfsk *
You will get with gmfsk package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Ham Radio |
| Package | gmfsk |
| Version | 0.6+0.7pre1-2.3 |
| Description | MFSK, RTTY and other digital mode terminal for HF/amateur radio |
| Sub Section | hamradio |