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In PostgreSQL 10, we stopped using System V semaphores on Linux systems. Update the example we give of an error message from a misconfigured system to show what people are most likely to see these days. Back-patch to 10, where PREFERRED_SEMAPHORES=UNNAMED_POSIX arrived. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA%2BhUKGLmJUSwybaPQv39rB8ABpqJq84im2UjZvyUY4feYhpWMw%40mail.gmail.com