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valgrind --leak-check=yes ./obfsproxy obfs2 --log-file=logfile --dest=127.0.0.1:9009 server 0.0.0.0:1051

reports

[warn] obfs2: Unknown argument '--log-file=logfile'.
[warn] You failed at creating a correct obfs2 line.

but also

==9488== 144 (16 direct, 128 indirect) bytes in 1 blocks are definitely lost in loss record 2 of 2
==9488==    at 0x4C244E8: malloc (vg_replace_malloc.c:236)
==9488==    by 0x406883: xmalloc (util.c:57)
==9488==    by 0x40852A: smartlist_create (container.c:27)
==9488==    by 0x40B305: launch_external_proxy (external.c:28)
==9488==    by 0x402427: obfs_main (main.c:262)
==9488==    by 0x542CC8C: (below main) (libc-start.c:228)