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A non-free library that runs on free operating systems acts as a trap for free software developers. The library's attractive features are the bait; if you use the library, you fall into the trap, because your program cannot usefully be part of a free operating system. (Strictly speaking, we could include your program, but it won't *run* with the library missing.) Even worse, if a program that uses the proprietary library becomes popular, it can lure other unsuspecting programmers into the trap.
The first instance of this problem was the Motif toolkit, back in the 80s. Although there were as yet no free operating systems, it was clear what problem Motif would cause for them later on. The GNU Project responded in two ways: by asking individual free software projects to support the free X toolkit widgets as well as Motif, and by asking for someone to write a free replacement for Motif. The job took many years; LessTif, developed by the Hungry Programmers, became powerful enough to support most Motif applications only in 1997.
Around the same time, another non-free GUI toolkit library began to gain in popularity. This was Qt, from Troll Technologies. Ultimately Qt was used in a substantial collection of free software, the desktop KDE.
Free GNU/Linux systems were unable to use KDE, because we could not use the library. However, some commercial distributors of GNU/Linux systems who were not strict about sticking with free software added KDE to their systems -- producing a system with more capabilities, but less freedom. The KDE group was actively encouraging more programmers to use Qt, and millions of new ``Linux users'' had never been exposed to the idea that there was a problem in this. The situation appeared grim.
The free software community responded to the problem in two ways: GNOME and Harmony.
GNOME, the GNU Network Object Model Environment, is GNU's desktop project. Started in 1997 by Miguel de Icaza, and developed with the support of Red Hat Software, GNOME set out to provide similar desktop facilities, but using free software exclusively. It has technical advantages as well, such as supporting a variety of languages, not just C++. But its main purpose was freedom: not to require the use of any non-free software.
Harmony is a compatible replacement library, designed to make it possible to run KDE software without using Qt.
In November 1998, the developers of Qt announced a change of license which, when carried out, should make Qt free software. There is no way to be sure, but I think that this was partly due to the community's firm response to the problem that Qt posed when it was non-free. (The new license is inconvenient and inequitable, so it remains desirable to avoid using Qt.)
How will we respond to the next tempting non-free library? Will the whole community understand the need to stay out of the trap? Or will many of us give up freedom for convenience, and produce a major problem? Our future depends on our philosophy.