View the most recent changes for the chkrootkit port at: chkrootkit.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for chkrootkit.
The raw portfile for chkrootkit 0.49 is located here:
http://chkrootkit.darwinports.com/dports/sysutils/chkrootkit/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/chkrootkit

The chkrootkit Portfile 56328 2009-08-26 06:05:32Z ryandesign macports.org $

PortSystem 1.0
Name: chkrootkit
Version: 0.49
Category: sysutils
Platform: darwin
Maintainers: nomaintainer
Description: chkrootkit is a tool to locally check for signs of a rootkit
Long Description: chkrootkit is a tool to locally check for signs of a rootkit.
Homepage: http://www.chkrootkit.org/
Master Sites: ftp://ftp.pangeia.com.br/pub/seg/pac/
Checksums: md5 304d840d52840689e0ab0af56d6d3a18 sha1 cec1a3c482b95b20d3a946b07fffb23290abc4a6 rmd160 8c23ed9859a7dcf7d43ac15049b48c863ab63e92

Patch Files: patch-Makefile

use_configure no

build.target sense all
build.args CC=${configure.cc}

destroot {
xinstall -m 755 -W ${worksrcpath} check_wtmpx chkdirs chklastlog chkproc chkrootkit chkutmp chkwtmp ifpromisc strings-static ${destroot}${prefix}/bin

set docdir ${destroot}${prefix}/share/doc/chkrootkit
xinstall -m 755 -d ${docdir}

xinstall -m 644 -W ${worksrcpath} ACKNOWLEDGMENTS COPYRIGHT README README.chklastlog README.chkwtmp ${docdir}
}

If you haven't already installed Darwin Ports, you can find easy instructions for doing so at the main Darwin Ports page.
Once Darwin Ports has been installed, in a terminal window and while online, type the following and hit return:

%  cd /opt/local/bin/portslocation/dports/chkrootkit
%  sudo port install chkrootkit  
Password: 

You will then be prompted for your root password, which you should enter. You may have to wait for a few minutes while the software is retrieved from the network and installed for you. Y ou should see something that looks similar to:

--->  Fetching chkrootkit
--->  Verifying checksum for chkrootkit
--->  Extracting chkrootkit
--->  Configuring chkrootkit
--->  Building chkrootkit with target all

--->  Staging chkrootkit into destroot

--->  Installing chkrootkit

- Make sure that you do not close the terminal window while Darwin Ports is working. Once the software has been installed, you can find further information about using chkrootkit with these commands:

%  man chkrootkit
%  apropos chkrootkit
%  which chkrootkit
%  locate chkrootkit

 Where to find more information: