This change:

commit d888bbc45a84946cafb4f4d2c89681a580cd89bc
Author: Brian Paul <bri...@vmware.com>
Date:   Tue Nov 17 13:39:13 2009 -0700

    progs/xdemos: added -lX11 -lpthread for GNU gold linker

breaks the build if you are building under a specific path prefix
(say, /opt/XORG) and you have an existing X11 installation in the
usual location (/usr, etc.)

Mesa gets configure with:

PATH=/opt/XORG/bin:$PATH ./configure --prefix=/opt/XORG --libdir=/opt/XORG/lib

And then we get, for example:

make[2]: Entering directory `/home/davem/src/GIT/XORG/mesa/mesa/progs/xdemos'
gcc -g -O2 -Wall -Wmissing-prototypes -std=c99 -ffast-math -fvisibility=hidden 
-fno-strict-aliasing  -fPIC  -DUSE_SPARC_ASM -D_GNU_SOURCE -DPTHREADS 
-DHAVE_POSIX_MEMALIGN -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIVER 
-DGLX_DIRECT_RENDERING -DGLX_INDIRECT_RENDERING -DHAVE_ALIAS  corender.o ipc.o 
-L../../lib -lGL  -lm -lX11 -lpthread -o corender
/usr/bin/../lib/libxcb-xlib.so.0: undefined reference to `_xcb_lock_io'
/usr/bin/../lib/libxcb-xlib.so.0: undefined reference to `_xcb_unlock_io'
collect2: ld returned 1 exit status

Reverting the commit, of course, makes the problem go away.

One way to fix this would be to propagate the --libdir prefix
down to these Makefiles.

The same exact problem exists in progs/egl, but since libEGL doesn't
link to libX11 any more, a simple revert of:

commit 8d0bdfa4335ea07a747f53635a57414d15c234b7
Author: Chia-I Wu <olva...@gmail.com>
Date:   Wed Aug 26 12:44:02 2009 +0800

    progs: EGL/X progs should link to libX11.
    
    Since 5a459d58fca2b71cb77c39f98df8a81ce6298421, libEGL no longer links
    to libX11.  Add the dependency to affected progs and cleanup
    prog/egl/Makefile.
    
    Signed-off-by: Chia-I Wu <olva...@gmail.com>

doesn't fix the problem.

Sigh... :-)

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