[mythtv] [PATCH] packaging: easier PREFIX change in settings.pro

[Jeremiah Morris]

[Nigel, Jan, and I have started working on changes for the 
much-requested Mac CVS binary; you'll be seeing a lot of 
packaging-related patches from us in the near future.  I'd appreciate 
it if any package maintainers would take a look and comment on these 
patches.]

The PREFIX setting for Myth is not editable without physically changing 
the settings.pro file.  Taking a page from the QGLViewer project, I'd 
like to change the section to:

isEmpty( PREFIX ) {
   PREFIX=/usr/local
}

This allows users, or (more to the point) packaging scripts, to execute:

qmake PREFIX=/my/custom/dir mythtv.pro

to install into custom directories, instead of needing to rewrite the 
settings.pro file.  The full patch is attached.

- Jeremiah

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