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Question on gcc install

Does gcc delete old version of their software during an install. I just
installed gcc/mingw 4.8.3-2 and have all versions from 4.7.3 to 4.8.3-2 but
(I think) only libraries and etc. for 4.8.3-2. Am I responsible for deleting
these older references? Will these older references work with the newer

These are the programs I have (for i in `ls /bin/i686* ls/bin/x86*`; do $i
--version; done | grep GCC)
i686-pc-cygwin-c++ (GCC) 4.8.2
i686-pc-cygwin-cpp (GCC) 4.8.2
i686-pc-cygwin-g++ (GCC) 4.8.2
i686-pc-cygwin-gcc (GCC) 4.8.2
i686-pc-cygwin-gcc-4.8.2 (GCC) 4.8.2
GNU Fortran (GCC) 4.8.2
i686-pc-mingw32-c++ (GCC) 4.7.3
i686-pc-mingw32-cpp (GCC) 4.7.3
i686-pc-mingw32-g++ (GCC) 4.7.3
i686-pc-mingw32-gcc (GCC) 4.7.3
i686-pc-mingw32-gcc-4.7.3 (GCC) 4.7.3
GNU Fortran (GCC) 4.7.3
i686-w64-mingw32-c++ (GCC) 4.8.2
i686-w64-mingw32-cpp (GCC) 4.8.2
i686-w64-mingw32-g++ (GCC) 4.8.2
i686-w64-mingw32-gcc (GCC) 4.8.2
i686-w64-mingw32-gcc-4.8.2 (GCC) 4.8.2
GNU Fortran (GCC) 4.8.2
x86_64-pc-cygwin-c++ (GCC) 4.8.3
x86_64-pc-cygwin-g++ (GCC) 4.8.3
x86_64-pc-cygwin-gcc (GCC) 4.8.3
x86_64-pc-cygwin-gcc-4.8.3 (GCC) 4.8.3
GNU Fortran (GCC) 4.8.3
x86_64-w64-mingw32-c++ (GCC) 4.8.2
x86_64-w64-mingw32-cpp (GCC) 4.8.2
x86_64-w64-mingw32-g++ (GCC) 4.8.2
x86_64-w64-mingw32-gcc (GCC) 4.8.2
x86_64-w64-mingw32-gcc-4.8.2 (GCC) 4.8.2
GNU Fortran (GCC) 4.8.2

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