>> Sure, I inadvertently tripped over the solution: build
>> without the proprietary nvidia package installed.
>>
>> The challenge is that we can't guarantee end-users
>> downstream will comply. In the build scripts for those three
>> packages I can insert a test for libGL.la. If found, then
>> halt/pause the build with a warning message. If a person
>> builds only for personal use, as I have done for the past
>> many years, building packages with nvidia installed is
>> harmless because that is the only person using the packages.
>> Such people will never notice problems or build failures, as
>> I never did.
>>
>> With that said, the thread you linked is 6 years old. Thus
>> the problem still exists and the problem never was
>> successfully resolved as promised.
>>
>> I can't provide build scripts to other users that way, or
>> pre-built packages. As end-users can use upstream versions
>> of these packages, just as I did, probably the best I can do
>> is insert warning messages in the build scripts along with
>> commentation.
>>
>> Ideas anyone?
>
> Anybody know what other packages are OpenGL dependent?
>

kdegraphics is one (for the POV ray modeller).  Not sure on the others,
but a search for #include <ql.h> or #include "gl.h" should turn up the
remaining modules.

Tim