From uwe_ this compile error when the assert( ) macro is compiled out: pv/sigsession.cpp: In member function 'void pv::SigSession::feed_in_header(const sr_dev_inst*)': pv/sigsession.cpp:222:12: warning: unused variable 'ret' [-Wunused-variable] pv/dialogs/connect.cpp: In member function 'void pv::dialogs::Connect::populate_drivers()': pv/dialogs/connect.cpp:103:5: warning: 'hwopts' may be used uninitialized in this function [-Wmaybe-uninitialized] uwe_: one might be related to that (IMHO incorrect) assert