anchor.diff:  sendttl_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,2,0});
   %% Option has no effect
   sendttl_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
  -sendttl_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,8,0});
  +sendttl_ok({unix,openbsd}, _OSVer) -> false; % not semver_lt(OSVer, {6,9,0});
   %%
   sendttl_ok({unix,_}, _) -> true;
   sendttl_ok(_, _) -> false.
  
positive.code: 
  %% Using the option returns einval, so it is not implemented.
  sendtos_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
  sendtos_ok({unix,netbsd}, OSVer) -> false;
  sendtos_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,8,0});
  sendtos_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
  sendtos_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {4,0,0});
  sendtos_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,2,0});
  
negative.code: %% Using the option returns einval, so it is not implemented.
  recvtos_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {17,6,0});
  %% Using the option returns einval, so it is not implemented.
  recvtos_ok({unix,openbsd}, _OSVer) -> false; % not semver_lt(OSVer, {6,9,0});
  %% Using the option returns einval, so it is not implemented.
  recvtos_ok({unix,netbsd}, _OSVer) -> false;
  %% Using the option returns einval, so it is not implemented.
  