CVI appears to be missing headers from C standard library

I am trying to use a driver that #includes <wchar.h>, which is supposed to be included in the C standard library (see https://en.wikipedia.org/wiki/C_standard_library). However, my program won't compile, saying <wchar.h> is not found. Looking in 
"C:\Program Files (x86)\National Instruments\CVI2015\include\ansi" I notice that most of the standard library headers are present, but several are missing, including <wchar.h>. 

Is there a way to update LabWindows to a more complete version of C, or point it to the full ANSI C standard library?