[ECOS] Re: configtool for linux building problems.

John Dallaway john@dallaway.org.uk
Thu Jul 11 12:54:00 GMT 2013

Hi Stefan

On 11/07/13 11:24, scas wrote:

> I have encoutered David's problem with "XGetWindowAttributes" but this is
> happening when using the "-lX11" flag. I am stuck at this point, don't know
> what to do. 
> Here is the error:
> /usr/bin/ld:
> /home/scas/ecos-stuff/wxGTK-2.8.8/lib/libwx_gtk2_core-2.8.a(corelib_utilsx11.o):
> undefined reference to symbol 'XGetWindowAttributes'
> /usr/bin/ld: note: 'XGetWindowAttributes' is defined in DSO
> /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libX11.so so try
> adding it to the linker command line
> /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/libX11.so: could not
> read symbols: Invalid operation
> collect2: ld returned 1 exit status
> If anyone could give me a hint what to do, I would greatly appreciate it.

Are you use the latest makefile.gnu file from CVS? Ref:


Note that the ordering of libraries on the linker command line is important.

I hope this helps.

John Dallaway
eCos maintainer

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