/usr/share/gem/examples/09.openGL/01.primQuad.pd is in gem-doc 1:0.93.3-9build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X obj 605 127 GLdefine GL_SMOOTH;
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#X obj 605 169 GLdefine GL_POLYGON;
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#X obj 468 527 GEMglShadeModel;
#X obj 621 509 GLdefine GL_FLAT;
#X text 52 17 this is an example how to use Gem as an openGL-wrapper:
;
#X text 47 79 you can use "any" openGL-command (like "glBegin") as
a Gem-object with a prepended "GEM" (like [GEMglBegin]);
#X text 32 378 to make use of GL-constants (like "GL_TRIANGLE") \,
use the object [GLdefine] \, that maps symbols to their corresponding
values.;
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