Hi csound developpers, i had to made some modifications in order for the compilation of csound5 to be succesfull under linux. In Opcodes/Makefile.in i had to change LIBS = @LIBS@ to LIBS = @LDFLAGS@ @LIBS@ In this case, LDFLAGS contain the necessary path to find the X11 library in Opcodes/mandolin.c all the call to make_DLineA, make_DLineL and DLineA_setDelay miss the first argument which should be ENVIRON *csound mandolin and mandolinset as well should be define with ENVIRON *csound as the first argument Also in configure.in, in the summary, i changed if test "$RTAUDIO"; then to if test "$USE_RTAUDIO"; then so that the summary is correct If you add me as a developper on the sourceforge page, i can do the check in myself. My sourceforge account name is 'antoine' thank you -- Antoine Lefebvre antoine.lefebvre@polymtl.ca