Решение проблем во FreeBSD < 9.x c bsd tar.

При обновлении портов на FreeBSD ниже 9.x возникают подобные проблемы с xz архивами:

# cd usr/ports/misc/mc 
# make 
===>  License GPLv3 accepted by the user 
===>  Found saved configuration for mc-4.8.1.6 
===> Fetching all distfiles required by mc-4.8.1.7 for building 
===>  Extracting for mc-4.8.1.7 
=> SHA256 Checksum OK for mc-4.8.1.7.tar.xz. 
===>   mc-4.8.1.7 depends on file: /usr/local/bin/xz - found 
===>   mc-4.8.1.7 depends on file: /usr/local/bin/perl5.14.2 - found 
tar: Unrecognized archive format: Inappropriate file type or format 
tar: Error exit delayed from previous errors. 
*** Error code 1 

Stop in /usr/ports/misc/mc. 
*** Error code 1 

Stop in /usr/ports/misc/mc.

Лечится довольно просто, установкой libarchive и 1 строчкой в /etc/make.conf:

#cd /usr/ports/archivers/libarchive
#make install clean
#echo 'TAR=/usr/local/bin/bsdtar' >> /etc/make.conf

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Ссылки по теме:
1. 2. Обновление портов и tar.Xz
3. Исправление ошибки во freebsd tar xz.