Where is an appropriate place to write an option for visual studio compiler (cl)

[k a]

I'm trying to build gstreamer from source code on windows10 (visual studio
2015).

I know cerbero is made, based on UTF-8, but my visual studio environment is
basically using another character code, so I want to tell "/source-charset:
utf-8 <http://d.hatena.ne.jp/keyword/utf-8>" option to cl compiler.
But I couldn't find an appropriate place in cerbero source directory.

Please let me know an appropriate place to write cl options to avoid
compile error.
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