On Wed, 6 Aug 2008, artur wrote: These log files seem to show that "make" and "make install" went fine. One of the few remaining explanations for your problem is that libraries in /usr/local/lib are not known to the run-time linker. Please try these experiments (at a command prompt): First, ldd /usr/local/bin/gretl_x_11 On the basis of what you have reported, I would expect to see a line saying something like libgretl-1.0.so.0 => not found Then try LD_LIBRARY_PATH=/usr/local/lib ldd /usr/local/bin/gretl_x_11 Based on your install.log, I would expect that to work OK (that is, no "not found" line). If I'm right so far, try LD_LIBRARY_PATH=/usr/local/lib /usr/local/bin/gretl_x_11 Does gretl start OK? If not, I'm flummoxed. If so, make your good fortune permanent by doing: sudo sh -c "echo /usr/local/lib >> /etc/ld.so.conf && ldconfig" That is, add /usr/local/lib to the path that the run-time linker expects to use, and update the linker's cache. Allin.