signal-desktop-legacy (Signal for Desktop) Signal is an encrypted instant messaging and voice calling application for Android, iOS, and the desktop. It uses the Internet to send one-to-one and group messages, which can include images and video messages, and make one-to-one voice/video calls. This is a repackaging of the official binary .deb file distributed by Open Whipser Systems. Version 8.1 is the latest version able to be run on slackware-15.0 without the glibc packages available in the testing folder. The signal-desktop slackbuild will be kept up-to-date and will work on slackware-current as well as any systems on slackware-15.0 with updated glibc packages in testing.