setgrent, getgrent, endgrent.
* ext/socket/socket.c (sock_s_gethostbyname): do not reverse lookup.
* Makefile.in: copy lex.c from $(srcdir) if it's not the current
directory. [ruby-dev:21437]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e