Help build NSS for Windows?

I am a system administrator, not a software developer.  I am trying to build NSS 3.25 for Windows; however, I am experiencing a Windows pop-up error during the build process and I don't know what to do.  Here is the error message:

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shlibsign.exe - Entry Point Not Found
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The procedure entry point PR_GetEnvSecure could not be located in the dynamic link library c:\build\mozilla-source\nss\cmd\shlibsign\WIN954.0_OPT.OBJ\shlibsign.exe. 
---------------------------
OK   
---------------------------

When I press the OK button, the build process terminates and I'm returned to the build environment command prompt.  I see this output near the end:

----------------

make[3]: Leaving directory `/c/build/mozilla-source/nss/cmd/shlibsign/mangle'
cd WIN954.0_OPT.OBJ ; sh "/c/build/mozilla-source/nss/cmd/shlibsign/."/sign.sh "/c/build/mozilla-source/nss/cmd/shlibsign/../../../dist/WIN954.0_OPT.OBJ" \
        "/c/build/mozilla-source/nss/cmd/shlibsign/WIN954.0_OPT.OBJ" WIN95 \
        "/c/build/mozilla-source/nss/cmd/shlibsign/../../../dist/WIN954.0_OPT.OBJ/lib" "/c/build/mozilla-source/nss/cmd/shlibsign/../../../dist/WIN954.0_OPT.OBJ/lib/softokn3.dll"
/c/build/mozilla-source/nss/cmd/shlibsign/WIN954.0_OPT.OBJ/shlibsign -v -i /c/build/mozilla-source/nss/cmd/shlibsign/../../../dist/WIN954.0_OPT.OBJ/lib/softokn3.dll
make[2]: *** [../../../dist/WIN954.0_OPT.OBJ/lib/softokn3.chk] Error 57
make[2]: Leaving directory `/c/build/mozilla-source/nss/cmd/shlibsign'
make[1]: *** [libs] Error 2
make[1]: Leaving directory `/c/build/mozilla-source/nss/cmd'
make: *** [libs] Error 2

----------------

This error occurs a few minutes into the build process.  The following files are in my C:\build\mozilla-source\dist\WIN954.0_OPT.OBJ\bin\ directory at the time this error message appears:

* bltest.exe
* example.exe
* fipstest.exe
* mangle.exe
* minigzip.exe
* nspr4.dll
* plc4.dll
* plds4.dll
* shlibsign.exe

I also tried to build NSS 3.23 and 3.24 but had the exact same result.

I am using Mozilla's guidance for building NSS on a Windows computer:

* https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Building
* https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Windows_Prerequisites

I'm using my work computer for this.  It is running Windows 10 1511 Enterprise x64.  I have Visual Studio Community 2015 installed along with its Common Tools for Visual C++ 2015 add on.  I am using the latest version of MozillaBuild (v2.20).  I start the build environment on my computer by launching an elevated command prompt, going to C:\build\mozilla-build\ and launching "start-shell-msvc2015.bat".  I'm using the BUILD_OPT=1 and OS_TARGET=WIN95 options before running "make nss_build_all".

I also tried setting up an Ubuntu 16.04 virtual machine and building NSS for Windows on there, but it only ran for a few seconds before ending with the following output:

----------------

In file included from /usr/include/stdio.h:0,
     from ../../config/now.c:6:
/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory
compilation terminated
../../config/rules.mk:446: recipe for target 'now.o' failed
make[2]: *** [now.o] Error 1
make[2]: Leaving directory '/home/<username>/Documents/nss-3.25/nspr/WIN954.0__OPT.OBJ/config'
../config/rules.mk:163: recipe for target 'export' failed
make[1]: *** [export] Error 2
make[1]: Leaving directory '/home/<username>/Documents/nss-3.25/nspr/WIN954.0__OPT.OBJ'
Makefile:128: recipe for target 'build_nspr' failed
make: *** [build_nspr] Error 2 

----------------

I don't really know how to stand up a build environment, so this doesn't really surprise me.

Can anyone help me understand how to solve this problem building NSS for Windows?  If this is not the right place to post this, can someone point me in the right direction?

I'm trying to obtain a new copy of the NSS certutil tool so I can use it to import CA certificates into the Firefox certificate store on Windows computers.

Thanks!
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