[...] pd-extended 0.43 dont use buttonbar-plugin.tcl. because there is massage in pd windows: UNHANDLED ERROR: can't find package base64 while executing "package require base64" ("uplevel" body line 8) invoked from within "uplevel #0 $tclcode" FAILED TO LOAD /usr/lib/pd-extended/extra/buttonbar-plugin.tcl
I think you need tcllib (sudo apt-get installl tcllib).
András