My problem was caused by incorrectly configuring xorgproto. I typed 'meson --prefix=/$XORG_PREFIX ..' instead of 'meson --prefix=$XORG_PREFIX ..' The slash caused //usr when compiling. Unfortunately, it didn't seem to cause an error message but caused problems when compiling Poppler.
When I successfully compiled poppler-0.67.0 on my BLFS 8.2 system it was apparent I'd made a mistake on my BLFS 8.3 system. The problem was right in front of me but I was blind to it. Ah well ... Perhaps posting the solution will help someone down the line.
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