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On 10 January 2012 00:54, John Harper wrote: > My little test program then compiled but wouldn't run even though the > library said to be missing does exist. It was peresumably put somewhere > that gfortran couldn't find it. What should I do now? Evidence: [...] > rimu[~]$ ./a.out > ./a.out: error while loading shared libraries: libquadmath.so.0: cannot open > shared object file: No such file or directory The dynamic linker needs to know how to find the library at run time. http://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.how_to_set_paths