On 20/10/17 07:19, Peter P. wrote: > Thank you! Now I found a more useful error message: > > ~/.local/lib/pd/extra/pix_opencv/pix_opencv.l_ia64: undefined symbol: _ZN9GemPixObj4SIMDEi You can humanize the mangled name with c++filt. Example: $ c++filt _ZN9GemPixObj4SIMDEi GemPixObj::SIMD(int) Claude -- https://mathr.co.uk