[gtkada] Configure doesn't find openGL

[Roger Mc Murtrie]

If I omit --with-GL-prefix=/usr/X11
I get:
configure: error: Missing OpenGL library
Roger


> On 5 Sep 2016, at 8:12 PM, Emmanuel Briot <briot at adacore.com> wrote:
> 
>> From Pascal's diff file I think the following change is necessary as it probably applies, at least, to most macs at 10.11.6 and Xcode 7.3.1.
> 
> These changes look correct at first sight, and indeed work on OSX (for configure).
> However, I am surprised that we have to use --with-GL-prefix=/usr/X11, where we are not building
> for X11 on the Mac. It is likely to lead to issues if gtk+ expects to use X11 here.
> 
> I think you should include these patches as part of your pull request when you manage to get
> things working.
> 
>> Normally, I would probably submit a bug report on these but is that the appropriate process here?
> 
> Sure, you can (on github).
> 
> 
> Thanks !
> 
> Emmanuel