On 04/21/2013 11:22 AM, Hartmut Noack wrote: > ../libgxw/gxw/GxFastMeter.cpp:153:13: nicht implementiert: Graphite loop > optimizations can only be used if the libcloog-ppl0 package is installed Hello Hartmut, If you want to build guitarix with the --optimization flag you need to install libcloog-ppl0. Jeremy