[PyQt] Annoying "cannot find -lGL" making PyQt on Linux

[David Cortesi]

Answering my own question, the problem was that, even though I installed
libgl-dev, somehow that install made only a dangling symlink for libGL.so.

There was a link /usr/lib/.../libGL.so -> /usr/lib/.../mesa/libGL.so.1.2.0
but there was no such target file. There was in fact a
mesa/libGL.so.10.1.2.28859, and when I made proper links to that, the
configure and make proceeded.

No idea why the install of libgl-dev should do this.
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