Created attachment 2678
Patch which explicitly links against X11
The new linker in binutils gold requires explicit linking:
"The important difference is that --no-add-needed is the default behavior of of GNU binutils-gold. Please provide all needed libraries to the linker when building your executables."
I'm currently working on the new release of wmdock.
I want to apply the patch on the next release.
Thanks you for the patch,
I've uploaded your patch to the xfce git repository:
Happy New Year