Thanks Julián for all the work. I tried
to compile shifter~ on ubuntu studio but this was the result:
sudo make shifter~
++++ info: using Makefile.pdlibbuilder version 0.6.0
++++ info: making target shifter~ in lib shifter
++++ info: linking objects in shifter~.pd_linux for lib
shifter
cc -rdynamic -shared -fPIC
-Wl,-rpath,"\$ORIGIN",--enable-new-dtags -o shifter~.pd_linux
shifter~.o -lc -lm
shifter~.o: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
Makefile.pdlibbuilder:884: recipe for target
'shifter~.pd_linux' failed
make: *** [shifter~.pd_linux] Error 1