When running a SLIC Linux binary from http://www.lcsim.org/dist/slic on your SL5 machine, you may receive an error about a missing libstdc++ library. By default, SL5 has gcc 4.x whereas SLIC binaries are generally built with gcc 3. The easiest way around this problem is to install the libstdc++ compatibility rpm for gcc 3.x. (compat-libstdc+-33-3.2.3-61.i386.rpm) After this has been installed, the correct libstdc++ should be found at runtime.