Macholib - Analyze and edit Mach-O headers

macholib can be used to analyze and edit Mach-O headers, the executable format used by Mac OS X.

It’s typically used as a dependency analysis tool, and also to rewrite dylib references in Mach-O headers to be @executable_path relative.

Though this tool targets a platform specific file format, it is pure python code that is platform and endian independent.


Macholib was written by Bob Ippolito and is currently maintained by Ronald Oussoren <>.

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