I'm running Pd 0.40-3-extended in Gentoo, everything seems to work fine except that I'm having serious problems with getting PD to recognize my Doepfer midi interface (analogue knobs to midi).
The only midi interface it does recognize is my midi keyboard which PD find as an OSS device #1.

However, the Doepfer interface works fine if you look at the raw output with cat:
cat /dev/midi
But PD just refuses to find find it.
Perhaps there is some cheap hack to fool PD to start caring about my /dev/midi instead of only listening to /dev/midi1?

Both the midi keyboard and Dopefer midi interface are run over USB.

Any one got some special tricks 'n tips perhaps?

run pd -alsamidi, connect to/from your outputs/inputs in qjackctl alsa midi tab?

I didn't really get the last part of your reply, however I got it working now

Doepfer is at /dev/midi = PD midi in 2
Midi keyboard is at /dev/midi2 = PD midi 3

So I launched my simple midi patch which uses ctlin (for doepfer) and notein (for midi keyboard) with:
pd -midiindev 2,3

Works perfectly!

ah, those little doepfer midi controllers are nice.