+ # 500016 is the first osreldate in which one could
+ # just link against libc_r without disposing of libc
+ # at the same time. 500016 ... up to whatever it was
+ # on the 31st of August 2003 can still be used with -pthread,
+ # but it is not necessary.
+
+ # Anton Berezin says that post 500something we're wrong to be
+ # to be using -lc_r, and should just be using -pthread on the
+ # linker line.
+ # So presumably really we should be checking that $osver is 5.*)
+ # and that `/sbin/sysctl -n kern.osreldate` -ge 500016
+ # or -lt 500something and only in that range not doing this:
+ ldflags="-pthread $ldflags"
+
+ # Both in 4.x and 5.x gethostbyaddr_r exists but
+ # it is "Temporary function, not threadsafe"...
+ # Presumably earlier it didn't even exist.
+ d_gethostbyaddr_r="undef"
+ d_gethostbyaddr_r_proto="0"
+ ;;
+
+ *)
+ # 7.x doesn't install libc_r by default, and Configure
+ # would fail in the code following
+ #
+ # gethostbyaddr_r() appears to have been implemented in 6.x+