[vtkusers] Motif not found during build

[Paul Melis]

Hi,

I'm trying to build 5.2.1 and all goes well until somewhere in the examples:

gmake[5]: Entering directory `/usr/paul/vtk-5.2-build/Examples/All'
Linking CXX executable /usr/paul/vtk-5.2-build/bin/Example1
/usr/bin/ld: cannot find -lXm
collect2: ld returned 1 exit status

Now I have (open)motif installed, and the lib is in /usr/X11R6/lib. With 
make VERBOSE=1 the actual link line is shown below, which indeed misses 
-L/usr/X11R6/lib

/home/paul/local/bin/c++     -Wno-deprecated  -Wno-deprecated  -fPIC   
CMakeFiles/Example1.dir/Example1.o  -o 
/usr/paul/vtk-5.2-build/bin/Example1 -rdynamic 
-L/usr/paul/vtk-5.2-build/bin -lXm -lvtkRendering -lvtkGraphics 
-lvtkImaging -lvtkIO -lvtkFiltering -lvtkCommon -lvtkftgl -lvtkfreetype 
-lGL /usr/X11R6/lib/libXt.so /usr/X11R6/lib/libSM.so 
/usr/X11R6/lib/libICE.so /usr/X11R6/lib/libX11.so 
/usr/X11R6/lib/libXext.so /usr/X11R6/lib/libXss.so 
/usr/X11R6/lib/libXft.so -lvtkverdict -lvtkDICOMParser -lvtkNetCDF 
-lvtkmetaio -lvtksqlite -lvtkpng -lvtktiff -lvtkzlib -lvtkjpeg 
-lvtkexpat -lvtksys -lpthread -ldl -lm 
-Wl,-rpath,/usr/paul/vtk-5.2-build/bin:/usr/X11R6/lib

So is there any way to tell CMake where to find Motif? Or is there a 
switch to disable just the GUI/Motif example?

Thanks,
Paul