[GRASS5] 61cvs: nviz doesn't start

Dear developers,
I'm working on a debian testing and a i386 pc.
I have compiled the last grass61 CVS snapshot using these options:
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CFLAGS="-g -Wall" ./configure --with-tcltk-includes=/usr/include/tcl8.3
--with-postgres-includes=/usr/include/postgresql --with-nls --with-glw
--with-glw-include=/usr/X11R6/include/GL --with-motif --with-sqlite
--with-freetype-includes=/usr/include/freetype2 --with-freetype
--with-cxx --enable-largefile
-------------------------------------------------------------------

the result is this one:

__________________________________________________________________
C compiler: gcc -g -Wall
C++ compiler: c++ -g -O2
FORTRAN compiler:
Building shared libraries: yes
64bit support: no

  NVIZ: yes

  X11 support: yes
  JPEG support: yes
  TIFF support: yes
  PNG support: yes
  Tcl/Tk support: yes
  PostgreSQL support: yes
  MySQL support: no
  SQLite support: yes
  OpenGL(R) support: yes
  ODBC support: no
  FFTW support: yes
  BLAS support: no
  LAPACK support: no
  Motif support: yes
  FreeType support: yes
  GLw support: yes
  NLS support: yes
  Readline support: no
  C++ support: yes
  openDWG support: no
  GDAL support: yes
  OGR support: yes
  Large File Support (LFS): yes
---------------------------------------------------------

The problem is that when I try to launch nviz I only obtain this result:

_____________________________________
GRASS 6.1.cvs (lat_long_arg):~ > nviz
Abortito
-------------------------------------

I can't understand which is the problem!!
I have tried to compile only the nviz module (as described into the
INSTALL file), but anything have changed..

can you give me some ideas to solve the problem???
is a problem due to the CVS or is a problem of mine??
thank you very much
Ivan

--
Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a
06125
Perugia (Italy)
e-mail: marchesini@unipg.it
        ivan.marchesini@gmail.com
tel: +39(0)755853760
fax: +39(0)755853756