Hi Dan, I think you probably have a recent gcc version (4.X.X) and that's why you get these warnings. Don't worry about this, they are absolutely safely. Newer versions of compiler are always more demanding on the programming quality. Cheers, Simon <div class="gmail_quote">On Mon, Jun 30, 2008 at 5:48 PM, dan ma <<a href="mailto:pegasusmd102@hotmail.com">pegasusmd102@hotmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div> Hi all,   There are some warnings when I compiled Gate_v3.1.2.   src/GateVSystem.cc:71: warning: unused parameter 'anOutputIDName' src/GateVSystem.cc:71: warning: unused parameter 'depth' src/GateVoxelCompressor.cc:46: warning: comparison is always true due to limited range of data type src/GatePrimaryGeneratorAction.cc:91: warning: unused parameter 'event' src/GateCylindricalPETSystem.cc:169: warning: format '%u' expects type 'unsigned int', but argument 3 has type 'size_t' I'm not sure if these warnings will affect the output of simulation.   Thanks,   Dan <div class="WgoR0d"> <hr>Connect to the next generation of MSN Messenger  <a href="http://imagine-msn.com/messenger/launch80/default.aspx?locale=en-us&source=wlmailtagline" target="_blank">Get it now! </a></div> </div> _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.healthgrid.org">Gate-users@lists.healthgrid.org</a> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote></div>