unicon -version
Unicon Version 12.1.  April 13, 2013

unicon -features
UNIX
POSIX
DBM
ASCII
co-expressions
concurrent threads
dynamic loading
environment variables
event monitoring
external functions
keyboard functions
large integers
multiple programs
pipes
pseudo terminals
system function
messaging
graphics
3D graphics
X Windows
libz file compression
PNG images
CCompiler gcc 4.7.2
Arch x86_32
Binaries at /home/bruce/unicon/bin/


Program being run from page 3 utr9b.pdf

procedure main(av)
    &window := open("gl attributes", "gl","canvas=hidden")
    write("glversion :", WAttrib("glversion"))
    write("glvendor :", WAttrib("glvendor"))
    write("glrenderer :", WAttrib("glrenderer"))
    close(&window)
end

output obtained

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  26 (X_GLXMakeContextCurrent)
  Serial number of failed request:  34
  Current serial number in output stream:  34

If I remove the canvas attribute on the open call I get

procedure main(av)
    &window := open("gl attributes", "gl")
    write("glversion :", WAttrib("glversion"))
    write("glvendor :", WAttrib("glvendor"))
    write("glrenderer :", WAttrib("glrenderer"))
    close(&window)
end

output obtained

glversion :1.4 Mesa 8.0.4
glvendor :Tungsten Graphics, Inc
glrenderer :Mesa DRI Intel(R) IGD


regards

Bruce G Rennie
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