nss build problem: could not open file certdata.c

Hi, I have being building nss & nspr for windows using visual studio 2015. The nss & nspr i clone it from https://hg.mozilla.org/projects/nspr & https://hg.mozilla.org/projects/nss respectively at date 26/feb/2017. The gyp & ninja, I build it from https://chromium.googlesource.com/external/gyp & git://github.com/ninja-build/ninja.git at date 27/feb/2017. I also use the mozilla make tools download from mozilla website.

I have actually found that something wrong with the auto generated file nss\out\release\obj\lib\ckfw\builtins\nssckbi.ninja at line 70, which is "..\..\..\out\Release\obj\lib\ckfw\builtins\nssckbi.gen/certdata.c". After doing some modification I found that in order for it to work, it need to be changed to "../../../out/Release/obj/lib/ckfw/builtins/nssckbi.gen/certdata.c" instead. 

May I know if this is a bug, or if there's something I didn't configure right?