? BUG - Tcl9.0b3 Linux - canvas bind

Please, can you run this 4-lines script on Linux with TclTk 9.0b3 ?
Note that it runs as expected with TclTk 9.0b3 on Windows and MacOS, so
I suspect
 a) my Linux build is wrong
 b) it's a bug only for unix (Linux Ubuntu in my case)
Any suggestion is appreciated.
Here's the script
## ---------------------------------------------------------------------
# Test with TclTk 9.0b3
#   Windows: OK
#   Linux (Ubuntu): not working (OVAL doesn't change color, no message
is printed)
#   MacOS: OK
pack [canvas .c -background yellow]
c create oval {20 20 200 200} -fill red  -activefill blue -tag OVAL
c bind OVAL <Enter> { puts "Entering the OVAL"}
c bind OVAL <ButtonPress-1> { puts "Clicked inside the OVAL"}
 #  Expected behaviour:
 #    when moving the cursor inside the OVAL
 #      - it turns from red to blue
 #      - a message is printed
 #    when clicking the OVAL
 #      - a message is printed
# -------------------------------------------------------------