Adding configure options when installing a port

[Ryan Schmidt]

On Jun 16, 2010, at 19:31, Stephen Langer wrote:

> Therefore it's a serious mistake for a packaging system to assume that it's ok to enable openmp in libraries.   A quick solution would be to provide both openmp and no-openmp variants, which would make users choose between fast stand-alone ImageMagick programs and libraries that can be linked by threaded apps.

We don't need two variants; we only need one variant, "openmp", which the user can either enable or disable. It just remains a question as to whether the variant should be enabled by default or not. What I'm hearing is that we should disable it by default.

> A better solution might be for the openmp and non-openmp versions of the libraries to have different names, so that both could be installed on the same system.

Ugh. That sounds nasty.