Thanks for reply but I know all of that. Apache working including php. However, will not execute Perl cgi scripts. It all worked in El Capitan.

Hi,

Are you sure? If so, what is the solution (what was the problem)?

There is only one reason apache would treat "hello.pl" as a text file,

its because it doesn't know to treat "hello.pl" differently,

because it has not been configured to treat "hello.pl" differently

Don't rely on default vendor apache configurations, vendors make changes . Maintain your own configuration file, avoid surprises.