Question: How do I avoid error message due to dependency failure during the installation of MATFOR on Fedora Core 3 and RedHat Enterprise Linux 4.0 (AS/ES/WS)? Answer: error: Failed dependencies: libstdc++.so.5 is needed by matfor_c-3.2-0.i686 libstdc++.so.5(CXXABI_1.2) is needed by matfor_c-3.2-0.i686 libstdc++.so.5(GLIBCPP_3.2) is needed by matfor_c-3.2-0.i686 libstdc++.so.5(GLIBCPP_3.2.2) is needed by matfor_c-3.2-0.i686 The message above is caused by the incompatibility of libstdc++ embedded in certain Linux systems and that embedded in MATFOR. By installing compat-libstdc++-33 package that contains libstdc++.so.5 prior to MATFOR installation, the problem can be solved. Download compat-libstdc++-33 package here.