$gpgsm --export-secret-key-p12 <Key ID>
failed, pinentry (0.7.5 or 0.8.0.svn231) dialog doesn't show up, pinentry wants
100%CPU and is not killable (needs to -9 to be dead)
$gpgsm -a --export-secret-key-p12 <Key ID>
works.
$pinentry
GETPIN
works.
encryption + signing is okay.