Android.mk invalid argument '-std=c99' not allowed with 'C++/ObjC++'

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I'm trying to integrate libfplutils printf redirection into an existing project with the older Android.mk system on NDK-13b.

I notice you have included an Android.mk in the jni tree of this project. However, it seems there may be a mistake that it has c library with the cpp code? Line 64: https://github.com/google/fplutil/blob/master/libfplutil/jni/Android.mk#L64

Thank you.