Mac OS XでLinuxのlddに相当するコマンドがotool、Lオプションで共有ライブラリの名前とバージョンが分かる。なるほど。
$ otool -L /Applications/Emacs.app/Contents/MacOS/Emacs /Applications/Emacs.app/Contents/MacOS/Emacs: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 1038.32.0) /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 152.0.0) /opt/local/lib/libdbus-1.3.dylib (compatibility version 8.0.0, current version 8.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0) /opt/local/lib/libncurses.5.dylib (compatibility version 5.0.0, current version 5.0.0) /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0) /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 44.0.0) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 550.29.0) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 38.0.0) /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 751.29.0)