Check out the IRAF installation on macOS web page.

• IRAF 2.18.1,
• X11IRAF 2.2,
• ctio a6113fe, 2023-11-12
• fitsutil v2024.07.06,
• mscred 8c160e5, 2023-12-12
• rvsao 2.8.5
• sptable 1.0.pre20180612
• st4gem 1.0
• xdimsum 6dfc2de, 2024-01-01

• install XCode tools (xcode-select --install)
• install XQuartz
• install ImageMagick from Brew (brew install imagemagick)
• run
  • make to build the host arch,
  • make MACARCH=x86_64 to build Intel/64bit installer on Apple Silicon
  • make MACARCH=i386 to build Intel/32 bit on Intel (<= OS X 10.14)
• the executables are ad-hoc signed, the package is unsigned