For example, setting CPUTYPE to p3 or above triggers this.
This is the same bug happened in ImageMagick, and the original patch can
be found at
http://www.imagemagick.org/pipermail/magick-developers/2006-April/002550.html
In fact, this patch was submitted in PR 101361, but a wrong version was
committed.
PR: ports/107086
Obtained from: GraphicsMagick cvs
and API stability.
The port does not build nor install the Perl and Tcl APIs -- these
will be added by separate ports.
PR: ports/83932
Submitted by: Ron van Daal (maintainer to be)