/usr/lib/pd/extra/Gem/GEMglBegin-help.pd is in gem 1:0.93.3-5ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #N canvas 144 70 497 292 10;
#X text 21 22 GEMglBegin - delimit the vertices of a primitive or a
group of like primitives;
#X text 21 61 C Specification: void glBegin( GLenum mode );
#X text 21 91 Parameters;
#X text 42 115 mode;
#X text 77 116 Specifies the primitive or primitives that will be created
from vertices presented between glBegin and the subsequent glEnd. Ten
symbolic constants are accepted: GL_POINTS \, GL_LINES \, GL_LINE_STRIP
\, GL_LINE_LOOP \, GL_TRIANGLES \, GL_TRIANGLE_STRIP \, GL_TRIANGLE_FAN
\, GL_QUADS \, GL_QUAD_STRIP \, and GL_POLYGON.;
#X text 71 244 http://www.glprogramming.com/blue/ch05.html#id5450783
;
#X text 22 228 OpenGL Reference page:;
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