local fatal;

local function softreq(...) local ok, lib =  pcall(require, ...); if ok then return lib; else return nil; end end

local function missingdep(name, sources, msg)

	print("");

	print("**************************");

	print("Prosody was unable to find "..tostring(name));

	print("This package can be obtained in the following ways:");

	print("");

	for k,v in pairs(sources) do

		print("", k, v);

	end

	print(msg or (name.." is required for Prosody to run, so we will now exit."));

	print("More help can be found on our website, at http://.../doc/depends");

	print("**************************");

	print("");

end

local lxp = softreq "lxp"

if not lxp then

	missingdep("luaexpat", { ["Ubuntu 8.04 (Hardy)"] = "sudo apt-get install liblua5.1-expat0"; ["luarocks"] = "luarocks install luaexpat"; });

	fatal = true;

end

local socket = softreq "socket"

if not socket then

	missingdep("luasocket", { ["Ubuntu 8.04 (Hardy)"] = "sudo apt-get install liblua5.1-socket2"; ["luarocks"] = "luarocks install luasocket"; });

	fatal = true;

end

local ssl = softreq "ssl"

if not ssl then

	missingdep("LuaSec", { ["Source"] = "http://www.inf.puc-rio.br/~brunoos/luasec/" }, "SSL/TLS support will not be available");

end

local md5 = softreq "md5";

if not md5 then

	missingdep("MD5", { ["luarocks"] = "luarocks install md5"; ["Source"] = "http://luaforge.net/frs/?group_id=155" });	

	fatal = true;

end

if fatal then os.exit(1); end