$ valgrind --leak-check=full ./nmap --proxies socks4://andrew:pass@127.0.0.1:8080 --script http-title scanme.nmap.org -p 80 -Pn
==14487== Memcheck, a memory error detector
==14487== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==14487== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==14487== Command: ./nmap --proxies socks4://andrew:pass@127.0.0.1:8080 --script http-title scanme.nmap.org -p 80 -Pn
==14487== 

Starting Nmap 6.49SVN ( https://nmap.org ) at 2015-08-21 03:26 PDT
Nmap scan report for scanme.nmap.org (45.33.32.156)
Host is up (0.025s latency).
Other addresses for scanme.nmap.org (not scanned): 2600:3c01::f03c:91ff:fe18:bb2f
PORT   STATE SERVICE
80/tcp open  http
|_http-title: Go ahead and ScanMe!

Nmap done: 1 IP address (1 host up) scanned in 11.73 seconds
==14487== 
==14487== HEAP SUMMARY:
==14487==     in use at exit: 1,255,306 bytes in 3,093 blocks
==14487==   total heap usage: 348,019 allocs, 344,926 frees, 47,743,329 bytes allocated
==14487== 
==14487== LEAK SUMMARY:
==14487==    definitely lost: 0 bytes in 0 blocks
==14487==    indirectly lost: 0 bytes in 0 blocks
==14487==      possibly lost: 0 bytes in 0 blocks
==14487==    still reachable: 1,255,306 bytes in 3,093 blocks
==14487==         suppressed: 0 bytes in 0 blocks
==14487== Reachable blocks (those to which a pointer was found) are not shown.
==14487== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==14487== 
==14487== For counts of detected and suppressed errors, rerun with: -v
==14487== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
$