I tried chkrootkit installation with MacPorts Version 1.320. $ port -d install chkrootkit And I failed in the installation as follows. ... ---> Attempting to fetch chkrootkit.tar.gz from ftp:// ftp.pangeia.com.br/pub/seg/pac/ % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 37791 100 37791 0 0 2288 0 0:00:16 0:00:16 --:--:-- 6405 ---> Verifying checksum(s) for chkrootkit DEBUG: Executing com.apple.checksum (chkrootkit) ---> Checksumming chkrootkit.tar.gz Error: Checksum (md5) mismatch for chkrootkit.tar.gz Portfile checksum: chkrootkit.tar.gz md5 b73fb9e365d2edcd031d65b16e965a18 Distfile checksum: chkrootkit.tar.gz md5 4c6455d202cef35395a673386e4bf01a ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ # same to chkrootkit-0.47 tarball's MD5 signature # ftp://ftp.pangeia.com.br/ pub/seg/pac/chkrootkit.md5 Error: Target com.apple.checksum returned: Unable to verify file checksums Warning: the following items did not execute (for chkrootkit): com.apple.activate com.apple.extract com.apple.checksum com.apple.patch com.apple.configure com.apple.build com.apple.destroot com.apple.install