/usr/lib/libstdc++.so.6 : version 'GLIBCXX_3.4.9' not found (required by my_app) :

/usr/lib/libstdc++.so.6 : version 'GLIBCXX_3.4.9' not found (required by my_app) :

because: libstdc++.so.6 is not compartible with the libstdc++.so we have used to compile my_app:

fix:

export LD_LIBRARY_PATH=/where/the/lib/folder/of/gcc/is:$LD_LIBRARY_PATH