In the doc build instructions, there's this line:

make O=-Dplot_gallery=0 html skips the gallery build.

Running this argument gets output that looks like the gallery is building but also results in many missing images and a statement that it didn't run.

Possible solutions:

• if the argument doesn't work, it should be removed from the docs
• if the argument does work, shouldn't generate progress bars for images.

Not sure if this is really an upstream-sphinx gallery bug.