These are the setting required for building against Freesurfer:

BUILD_EXAMPLES        OFF
BUILD_SHARED_LIBS     ON
CMAKE_BUILD_TYPE      Release
CMAKE_INSTALL_PREFIX  /usr/pubsw/packages/vtk/5.0.2
TCL_INCLUDE_PATH      /usr/pubsw/packages/tcltktixblt/current/include
TCL_LIBRARY           /usr/pubsw/packages/tcltktixblt/current/lib/libtcl8.4.so
TK_INCLUDE_PATH       /usr/pubsw/packages/tcltktixblt/current/include
TK_LIBRARY            /usr/pubsw/packages/tcltktixblt/current/lib/libtk8.4.so
VTK_DATA_ROOT         /usr/pubsw/packages/vtk/5.0.2/src/VTKData
VTK_USE_PARALLEL      OFF
VTK_USE_RENDERING     ON
VTK_USE_RPATH         OFF
VTK_USE_SYSTEM_EXPAT  ON
VTK_USE_SYSTEM_FREETYPE ON
VTK_USE_SYSTEM_JPEG   ON
VTK_USE_SYSTEM_PNG    ON
VTK_USE_SYSTEM_TIFF   ON
VTK_USE_SYSTEM_ZLIB   ON
VTK_USE_TK            ON
VTK_WRAP_JAVA         OFF
VTK_WRAP_PYTHON       OFF
VTK_WRAP_TCL          ON


BUILD_SHARED_LIBS=ON and VTK_WRAP_TCL=ON are necessary to allow KWWidgets to
build.  Notice also the Tcl and Tk are pointing at the Tcl/Tk libs that
Freesurfer uses, ensuring fullest compatibility.