Hi,
there's a #define clash between pg_config_manual.h and FreeBSD's
/usr/include/machine-amd64/param.h which also defines CACHE_LINE_SIZE.
It's probably not really a PostgreSQL bug, but it seems easy enough to
rename that definition now as it's only present in 9.4+. It's only
used in one file, xlog.c: 375d8526f2900d0c377f44532f6d09ee06531f67
Christoph
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