Revision d3fcbb16 configure

b/configure
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#include <X11/Xlib.h>
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#include <GL/gl.h>
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#include <GL/glx.h>
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int main(void) { return GL_VERSION != 0; }
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int main(void) { glBegin(0); glXQueryVersion(0,0,0); return 0; }
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EOF
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  if compile_prog "" "-lGL" ; then
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  if compile_prog "" "-lGL -lX11" ; then
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    opengl=yes
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  else
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    if test "$opengl" = "yes" ; then

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