Fails install with no error message

[whackyhack]

When running this as non-root user (as most Mac users do), the script will complete compilation, and pretend to complete installation with no error message. But the installation (to /usr/local/) silently fail. (The compiler/linker artifacts appear to be removed after that, too.)

Expected behavior is for the script to fail and print a message about privilege when this happens.

[kalilinux-png]

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