To find out the SDK and Deployment Target of some binary you should explore the LC_VERSION_MIN_MACOSX load command. Use otool -l <some_binary>
to see load commands.
Example:
$otool -l my_binary
...
Load command 9
cmd LC_VERSION_MIN_MACOSX
cmdsize 16
version 10.7
sdk 10.8
...
$otool -l /System/Library/Frameworks/CoreWLAN.framework/CoreWLAN
...
Load command 8
cmd LC_VERSION_MIN_MACOSX
cmdsize 16
version 10.8
sdk 10.8
...
Example with piping to grep
:
otool -l my_binary | grep -A 3 LC_VERSION_MIN_MACOSX