gen_uuid.php

<?php
function gen_uuid() {
    return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
        // 32 bits for "time_low"
        mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),

        // 16 bits for "time_mid"
        mt_rand( 0, 0xffff ),

        // 16 bits for "time_hi_and_version",
        // four most significant bits holds version number 4
        mt_rand( 0, 0x0fff ) | 0x4000,

        // 16 bits, 8 bits for "clk_seq_hi_res",
        // 8 bits for "clk_seq_low",
        // two most significant bits holds zero and one for variant DCE1.1
        mt_rand( 0, 0x3fff ) | 0x8000,

        // 48 bits for "node"
        mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
    );
}

gen_uuid.sh

#!/bin/bash
uuidgen-c()
{
    local UUID=$(uuidgen)
    echo "// $UUID"
    echo "#define NS__IID \\"
    echo "{ 0x${UUID:0:8}, 0x${UUID:9:4}, 0x${UUID:14:4}, \\"
    echo -n "  { 0x${UUID:19:2}, 0x${UUID:21:2}, 0x${UUID:24:2}, "
    echo -n "0x${UUID:26:2}, 0x${UUID:28:2}, 0x${UUID:30:2}, "
    echo "0x${UUID:32:2}, 0x${UUID:34:2} } }"
}