For the linker:
otool --version Expected output: cctools-6.5 or llvm-otool (cctools-6.5) Cctools 6-5 Download
Check the apple-oss-distributions/cctools GitHub releases or ask in legacy developer forums – but always verify SHA checksums. Found this helpful? Share it with anyone maintaining an old iOS or OS X build pipeline. For the linker: otool --version Expected output: cctools-6
For 99% of modern macOS work, skip cctools 6.5. But for that 1% legacy project or reverse engineering task, this guide will get you compiling again. Cctools 6-5 Download
export PATH=/usr/local/cctools-6.5/bin:$PATH Warning: Only download from verified sources like GitHub releases or your own Xcode backup.
Note: Homebrew no longer keeps 6.5 readily bottled. Method 2 is more reliable. Apple released cctools 6.5 as open source. Use the official Darwin tools repo.