trying the options, after modifying the time in 'local time', the app crashes and I got :
~/XyGrib$ ./XyGrib
libpng warning: iCCP: known incorrect sRGB profile
./XyGrib : ligne 3 : 2439 Erreur de segmentation bin/XyGrib $*
don't know if the last message was generated by the crash.
re-launch : ok
on my debian-stretch_xfce, I created a launcher in the board, with the command :
/home/username/XyGrib/XyGrib
that works fine

thank you very much !