error: 'fileno' was not declared in this scope

Hello,
Big fan to the IDEs brought by JB, can't help to try CLion during EAP. Was trying to compile some code on Windows using Cygwin, got this error with gtest:

/usr/local/include/gtest/internal/gtest-port.h: In function 'int testing::internal::posix::FileNo(FILE*)':
/usr/local/include/gtest/internal/gtest-port.h:1741:51: error: 'fileno' was not declared in this scope
inline int FileNo(FILE* file) { return fileno(file); }

I googled it for a little bit and understand that I need to apply -std=gnu++0x rather than -std=c++0x when using g++ but since I'm not calling g++ directly but through CLion, not sure how am I supposed to do this. Anyone? Thanks.