There compiler error,when UE4_LINUX_USE_LIBCXX=0

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export UE4_LINUX_USE_LIBCXX=0 && make ProjectServer_Debug

there error like this

Runtime/Core/Public/Linux/LinuxPlatformMath.h:65:52: error: use of undeclared identifier ‘isnan’
static FORCEINLINE bool IsNaN( float A ) { return isnan(A) != 0; }
^
Runtime/Core/Public/Linux/LinuxPlatformMath.h:66:55: error: use of undeclared identifier ‘isfinite’; did you mean ‘std::isfinite’?
static FORCEINLINE bool IsFinite( float A ) { return isfinite(A); }
^~~~~~~~
std::isfinite
/usr/bin/…/lib/gcc/x86_64-linux-gnu/5.4.0/…/…/…/…/include/c++/5.4.0/cmath:586:3: note: ‘std::isfinite’ declared here