Hi again, I'm pleased to report that I've got past this hurdle. For some reason, the server didn't have both the i386 and x86_64 versions of gd-devel, libpng-devel, freetype-devel and libjpeg-devel installed, only one (and it wasn't consistent as to which one either). How that happened, I don't know, but it all works now that both versions of each of those packages are installed. Cheers, Guy. <div class="gmail_quote">---------- Forwarded message ---------- From: Guy Waugh <<a href="mailto:guidosh@gmail.com">guidosh@gmail.com</a>> Date: Tue, Jul 21, 2009 at 11:43 AM Subject: Compiling nagios-3.0.6 on RHEL5-x86_64 To: Nagios Users Mail-list <<a href="mailto:nagios-users@lists.sourceforge.net">nagios-users@lists.sourceforge.net</a>> Hi all, I'm trying to get nagios-3.0.6 compiled on RHEL5-x86_64, and I can't get configure to think that it's found a working libgd/libpng/libjpeg. Nagios is working, but I'm trying to get NDOUtils installed (so I can install NagVis), and to do that, I needed to recompile nagios with '--enable-event-broker', which made me think that maybe I'll need the graphics stuff for NDOUtils and/or NagVis (please let me know if this is incorrect). I'm using this as my configure line: <snip> </div>