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Instead of XXX_IN_XLOCALE_H for several features XXX, let's just include <xlocale.h> if HAVE_XLOCALE_H. The reason for the extra complication was apparently that some old glibc systems also had an <xlocale.h>, and you weren't supposed to include it directly, but it's gone now (as far as I can tell it was harmless to do so anyway). Author: Thomas Munro <thomas.munro@gmail.com> Discussion: https://postgr.es/m/CWZBBRR6YA8D.8EHMDRGLCKCD%40neon.tech