https://bugs.openldap.org/show_bug.cgi?id=9348
--- Comment #14 from Quanah Gibson-Mount quanah@openldap.org --- and earlier Commits: • 997b28d0 by Howard Chu at 2020-09-16T15:11:01+01:00 ITS#9348 don't declare sys_errlist if not present
If HAVE_SYS_ERRLIST is false, nothing uses them anyway, so the declarations serve no purpose. Just breaks the compile if the library actually defines them (and we are avoiding using them).