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===Install an Octave Port===
MacPorts' Octave port includes the non-GPL [ METIS]. To avoid license violations do not bundle Metis with Octave and then distribute to others. In order to eliminate the Metis dependency, a local portfile may be used, and edited to remove metis. A second motivation to use a local portfile is that the portfiles for the 3.4.x and 3.6.x series did not include all dependencies for the {{Codeline|<nowikicode>print</nowikicode>}} feature. The missing dependencies are [ epstool], [ pstoedit], and [ transfig]. A third motivation for a local portfile is to provide additional flexibility in resolving problems with creating an Octave DMG using the <code>port mdmg ...</code> command .
A [[Prototype MacPorts PortFile|prototype portfile]] which does not depend upon METIS and does depend upon epstool, pstoedit, and transfig has been prepared. After [ creating a local portfile repository] an Octave portfile may be added to the local repository using the commands below.
<nowiki>mkdir -p ~/ports/math/octave-local
cp ~/Desktop/portfile ~/ports/math/octave-local</nowiki>
This assumes the Octave portfile had been placed on the user's Desktop, and that the local portfile repository is located in the users home folder and named {{Codeline|<nowikicode>ports</nowikicode>}}. After adding the portfile, the local repository must be indexed for MacPorts to recognize it.
<nowiki>cd ~/ports
portindex -f</nowiki>
<nowiki>sudo port install octave-local @3.6.4+atlas+fltk+gcc47</nowiki>
The use of the {{Codeline|<code>+atlas}} </code> variant is encouraged as bugs exist for Apple's {{Codeline|accelerate}} framework in both MacOS 10.6 and 10.7. Octave's developers have included a fix for MacOS 10.6, but the fix does not work for MacOS 10.7. There is some commentary on this in various developers discussion forums. For example, see [ this Homebrew thread (Octave 3.4 fails on lion)], [ this R-Sig-Mac thread (R 2.13.1-patched, vecLib problem on Lion)], and [ the COIN-OR thread (Ipopt - problems on OS X 10.7 Lion)]. Use of Apple's {{Codeline|accelerate}} framework should also be avoided for {{Codeline|arpack}} and {{Codeline|qrupdate}}. To install the recommended variants, use the {{Codeline|port}} commands below.
<nowiki>port install arpack +atlas+gcc47


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