[ncl-install] problem running graphics

[Craig Miller]

Mary

I hope you don't mind revisiting an old thread, but I've just 
encountered a similar problem to the one that Ben had. In my case I 
definitely had the X11 libraries installed, because I could successfully 
execute the command 'ng4ex gsun01n' and get an X11 window. On trying to 
execute the command 'ncargex cpex08' however I ended up with the same 
error that Ben had. Trying your suggestion to use the '-L' option to 
specify the location of the libXext library also failed.

The problem appears to be that many Linux distributions only have the 
library components needed to run X11 applications. If you want to 
compile code that includes the X11 libraries you have to make sure that 
you have also downloaded the associated development packages in addition 
to the standard library packages. In my case downloading and installing 
the libXext development package solved the problem.

Craig

Mary Haley wrote:
> Ben,
>
> You don't appear to have the X11 libraries installed on your system.  
> Either that, or they are
> not installed to /usr/X11R6/lib.
>
> I *think* you can compile without X11, but then you will not be able  
> to send your output
> to an X11 window.  Try:
>
> ncargex -noX11 cpex08
>
> For the longer term, I recommend getting the X11 libraries installed  
> on your system.
>
> If you do have the X11 libraries (libX11.a, libXext.a, etc) already on  
> your system,
> then use the "-L" option to point to this location, and compile the  
> program with:
>
> gfortran -fPIC -fno-second-underscore -fno-range-check -O -o cpex08
> cpexcc.f cpex08.f -L/usr/local/lib -L/path/to/X11/libs -lncarg - 
> lncarg_gks -lncarg_c -lX11 -lXext -lpng -lz
>
> where "/path/to/X11/libs" should be replaced by the path to your X11  
> libraries.
>
> --Mary
>