A common macOS issue: a .dylib references an absolute path that doesn’t exist on your system.
install_name_tool -change /old/path/libfoo.dylib @rpath/libfoo.dylib mybinary
otool -L mybinary
Cctools 6.5 handles @rpath tokens more reliably than older versions. Cctools 6.5
Even today, developers may encounter cctools 6.5 when: A common macOS issue: a
Newer cctools (e.g., 9xx, 10xx as part of Xcode 12+) have introduced changes such as: Cctools 6
Thus, cctools 6.5 is now frozen in time—a stable, battle-tested release for projects that require predictable Mach-O behavior without the churn of Apple’s rapid toolchain evolution.
While Cctools 6.5 remains stable, the open-source ecosystem is already moving toward version 7.0, which will include support for:
However, for production environments requiring reliability and broad compatibility, Cctools 6.5 is the recommended baseline as of 2025. Major projects like Homebrew, Rust (for x86_64-apple-darwin targets), and Go’s macOS port all test against Cctools 6.5.