GPIO won't work with Pure Data extended [closed]

Question

I'm running a script at log-in on my Raspberry Pi B+ (I call it in the .bashrc). The script runs Jack-Audio and then launch a Pure Data patch that deals with audio and GPIOs. The audio part works well but not the GPIO one (a led should be on when the Pd patch opens and a button should let me switch it on/off).

It looks like pdwiringPi can't speak to GPIOs when called in a script on log-in whereas when I run this script manually after logging in, it works fine.

I precise that I don't have any errors whatever the method I use (automatic on log-in or manually after logging in)

Am I doing something wrong when using the pdwiringPi in Pure Data at log-in?

Here is the script:

export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket  
sleep 2  
jackd -dalsa -D -i 2 -o 2 -n 3 -r 44100 -p 256 -P&  
sleep 2  
pd-extended -rt -jack -nogui  -open wire.pd