On 03/20/12 02:29, MacArthur, Ian (SELEX GALILEO, UK) wrote:
> That said, ISTR that it really only ever worked on the old
> SGI machines, which *nobody* has anymore (except maybe the
> one Greg uses as a fan-heater from time to time...)
>
> Or I may be wrong...
No, I think you're right, nobody has SGI's anymore. ;D
Looking at configure, though I find it hard to understand,
it seems to grep the output of 'xprop -root' for the string
SERVER_OVERLAY_VISUALS to determine if overlays are supported.
I just looked at my recent linux build of 1.3.x, and HAVE_OVERLAY
was detected as 'off', and indeed there's no overlay strings in my
machine's xprop output.
Here's the HAVE_OVERLAY section from my linux/fltk1.3.x config.h
indicating the possibly SGI-specific aspect of this flag:
/*
* HAVE_OVERLAY:
*
* Use the X overlay extension? FLTK will try to use an overlay
* visual for Fl_Overlay_Window, the Gl_Window overlay, and for the
* menus. Setting this to zero will remove a substantial amount of
* code from FLTK. Overlays have only been tested on SGI servers!
*/
#define HAVE_OVERLAY 0
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