macOS DYLD_LIBRARY_PATH security blocking

March 16, 2026

Environment variables that start with DYLD_ are restricted by macOS, and are not passed to child processes by default for security reasons. A workaround for this is to use a dummy environment variable that does not start with DYLD_, and then use a wrapper script to read that variable and set the DYLD_LIBRARY_PATH environment variable accordingly. This is necessary because DYLD_LIBRARY_PATH is read at program startup, and setting it within a program will not have any effect on the dynamic linker used by that program. The wrapper script can be used to set the DYLD_LIBRARY_PATH environment variable before executing the desired program, allowing it to find the necessary libraries without being blocked by macOS security restrictions.