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+Call glXSwapBuffers instead of glCopyPixels if OpenGL read and draw buffers
+would perform a copy from back to front buffer.
+
+use with
+LD_PRELOAD=copy_pixels_swap_hack.so ${YOUR_PROGRAM}
+
+Refer to the ld.so(8) manpage for the path at which the preloaded shared
+objects is searched for.