[Fluxus] Running error since update to PPA racket 5.1.2-2

[Ted]

Hi dear list,
I have this little problem since I updated racket from the PPA repo.
Fluxus compilation did well with these commands:
scons RacketPrefix=/usr RacketCollects=/usr/share/racket/collects
sudo scons RacketPrefix=/usr RacketCollects=/usr/share/racket/collects
install

but at the launch of Fluxus I get this:
~/git/fluxus $ fluxus
SIGSEGV MAPERR si_code 1 fault on addr 0x2b
Abandon

I don't know how to get more debug informations.
If you have an idea on this...

Thanks in advance.

Ted

ps:I'm on Linux Mint 11 Katya (based on Ubuntu 11.04 Natty) and worked
well with PPA racket 5.1.2-1 (something like that)
ps:I see on the repo the 5.1.2-5 is on the way, but I can't really wait
for it