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Re: Xft library warning?

From: John W. Eaton
Subject: Re: Xft library warning?
Date: Thu, 11 Jan 2018 16:28:01 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 01/11/2018 09:37 AM, Ben Abbott wrote:
On Jan 10, 2018, at 11:47 PM, Mike Miller <address@hidden> wrote:

On Wed, Jan 10, 2018 at 19:38:24 -0800, Ben Abbott wrote:
On Jan 10, 2018, at 19:32, Dmitri A. Sergatskov <address@hidden> wrote:
I think freetype is a higher level library that uses Xft on X11 systems.

It's the other way around, Xft is an interface for X11 to use FreeType.

Anyone know why Xft is needed by Octave? Is it used for the GUI, or is it used 
for figure text objects?

I think it is needed on GNU/Linux systems for FLTK. The Xft library is
never used by Octave directly, the configure script only checks for it
because a build error may occur on some systems that have FLTK installed
but are missing Xft. It's more like Octave is making sure that the
dependency is installed.

See https://lists.gnu.org/archive/html/octave-maintainers/2013-11/msg00629.html

This may no longer be strictly necessary on current systems, but it
might take some effort to be sure that it can be dropped safely.


Ok. It sounds like we can safely ignore the warning on macOS (although it might 
be nice to eliminate the warning when not using X11 on macOS).

If I understand correctly, we only check for Xft if X11 is present. How can we know whether X11 is not needed on OS X? Or how can we tell whether Xft is not needed, regardless of whether X11 is needed?


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