Reconfiguring FreeBSD Ports – Remove OPTIONS config For Any Port

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While building Apache port I was presented with a menu from which I selected certain build options. However, certain option giving out error as follows:
===> apache-2.2.8 mod_mem_cache requires WITH_THREADS.
*** Error code 1

All I wanted to do is disable mod_mem_cache and build Apache again. Unfortunately, it is not allowing me to clear out configuration option. How do I remove all selected options and allow me to start over again?

FreeBSD install Perl language

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Q. I need Perl programming language to run scripts. How do I install perl on FreeBSD operating system?

A. Practical Extraction and Report Language or Perl can be installed using FreeBSD ports or binary package system. Perl is a language optimized for scanning arbitrary text files, extracting information from those text files, and printing reports based on that information. It’s also a good language for many system management tasks. The language is intended to be practical (easy to use, efficient, complete) rather than beautiful (tiny, elegant, minimal).

Install perl using FreeBSD ports

Perl5 port is located at /usr/ports/lang/perl5.8. Type the command as follows to install Perl5:
# cd /usr/ports/lang/perl5.8
# make;make install;make clean

Now perl will be installed and binary path to perl is /usr/local/bin/perl.

Install perl using FreeBSD pkg_add command

Just type the following command:
# pkg_add -v -r perl