AC_DEFUN([CMU_SOCKETS], [
save_LIBS="$LIBS"
LIB_SOCKET=""
AC_CHECK_FUNC(connect, :,
AC_CHECK_LIB(nsl, gethostbyname,
LIB_SOCKET="-lnsl $LIB_SOCKET")
AC_CHECK_LIB(socket, connect,
LIB_SOCKET="-lsocket $LIB_SOCKET")
)
LIBS="$LIB_SOCKET $save_LIBS"
AC_CHECK_FUNC(res_search, :,
LIBS="-lresolv $LIB_SOCKET $save_LIBS"
AC_TRY_LINK([[
const char host[12]="openafs.org";
u_char ans[1024];
res_search( host, C_IN, T_MX, (u_char *)&ans, sizeof(ans));
return 0;
]], LIB_SOCKET="-lresolv $LIB_SOCKET")
)
LIBS="$LIB_SOCKET $save_LIBS"
AC_CHECK_FUNCS(dn_expand dns_lookup)
LIBS="$save_LIBS"
AC_SUBST(LIB_SOCKET)
])