[ODE] x11 build

[Rodrigo Hernandez]

Perhaps, however sometimes (or on some platforms) those variables get 
garbage in them, halting compilation,
I'd have to take a look at exactly how are those meant to be used, just 
throwing them into the compiler flags is,
like the change message reads, problematic.

Bram Stolk wrote:
> I have my suspicions about this change to configure.in:
>
> r955 | kwizatz | 2006-05-12 05:27:50 +0200 (Fri, 12 May 2006) | 1 line
>
> Removed problematic X include and library path inclussions into CFLAGS CXXFLAGS and LDFLAGS.
>
>
> Nowhere on my cmd line, X11 is included, even though the configure
> run reports that:
>
> checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include
>
> I think that $x_includes should be used, after it has been set
> by AC_PATH_X
>
>   Bram
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