DECIMAL_COMPACT_SHORT
DECIMAL_COMPACT_LONG
POSIX_SC_OPEN_MAXIPPROTO_ICMP
IPPROTO_ICMPV6
TCP_FUNCTION_BLK (FreeBSD only)
TCP_FUNCTION_ALIAS (FreeBSD only)
TCP_REUSPORT_LB_NUMA (FreeBSD only)
TCP_REUSPORT_LB_NUMA_NODOM (FreeBSD only)
TCP_REUSPORT_LB_NUMA_CURDOM (FreeBSD only)
TCP_BBR_ALGORITHM (FreeBSD only)
AF_PACKET (Linux only)
IP_BINDANY (FreeBSD/NetBSD/OpenBSD only)
SO_BUSY_POLL (Linux only)
UDP_SEGMENT (Linux only)
SHUT_RD
SHUT_WR
SHUT_RDWR
IMAGETYPE_HEIF
IMAGETYPE_SVG
when libxml is loaded.