Intercom currently has the following requirements of the hardware and software on which it is installed.
ANSI C compiler with appropriate libraries.
Unix-like system such as Linux or BSD which supports the Open Sound System sound API.
Full-duplex audio interface hardware supported by OSS.
Intercom can also use the following optional components if they are installed. In most cases, these components will be automatically detected at compile-time.
GNU ReadLine library (if advanced line-input functions are desired).
OpenSSL library (if encryption support is desired).
libGSM library (If GSM compression is desired). This library comes bundled with Intercom in any case.