Determine minimum OSX version a binary was compiled for

by

Use otool -l /path/to/binary and inspect the LC_VERSION_MIN_MACOSX load command; specifically, the version field.

For example, a binary compiled with the 10.8 SDK with deployment target (-mmacosx-version-min) 10.8 should have an LC_VERSION_MIN_MACOSX like this:

Load command 9
      cmd LC_VERSION_MIN_MACOSX
  cmdsize 16
  version 10.8
      sdk 10.8

whereas a binary compiled with the 10.8 SDK with deployment target 10.7 should have an LC_VERSION_MIN_MACOSX load command like this:

Load command 9
      cmd LC_VERSION_MIN_MACOSX
  cmdsize 16
  version 10.7
      sdk 10.8

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