If I set in .bashrc: export TCLLIBPATH="/usr/lib/tcl8.3 /usr/lib/tk8.3 /home/jaume/VTKMY/Wrapping/Tcl /home/jaume/VTKMYBIN/lib /home/jaume/VTKMYBIN/lib/vtk/tcl /home/jaume/VTKMYBIN/Wrapping/Tcl" It seems to work: % package require vtk 4.0 % package require vtkmy 4.0 % vtkBar bar bar % vtkBar2 bar2 bar2