You can uninstall or removes an installed libgfortran-4.9-dev package itself from Ubuntu 16.10 (Yakkety Yak) through the terminal,
$ sudo apt-get remove libgfortran-4.9-dev
If you would like to remove libgfortran-4.9-dev and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libgfortran-4.9-dev
If you use with purge options to libgfortran-4.9-dev package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libgfortran-4.9-dev
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libgfortran-4.9-dev
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