Building Blender 2.8 on Windows gives strange git error

Hi guys, 

Since a few weeks I'm getting errors like this from time to time (not allways)
when doing a "make update" for building Blender 2.8 on Windows 10:
Auto packing the repository in background for optimum performance.
See "git help gc" for manual housekeeping.
Counting objects: 1415772, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (167033/167033), done.
Writing objects: 100% (1415772/1415772), done.
Total 1415772 (delta 1244156), reused 1415686 (delta 1244070)
Unlink of file '.git/objects/pack/pack-3098e0da80e963858dedbca1cb944735c6fb99a3.idx' failed. Should I try again? (y/n)
When I replace slashes by backslashes (the windows path separator),  
I can manually delete the given file, in this example:

del .git\objects\pack\pack-3098e0da80e963858dedbca1cb944735c6fb99a3.idx

After that, repeating "make update" is always successfull.
For any reason git uses the wrong path separator, but why and why only sometimes ?
Using git version

Any ideas ?

seems to be a git thing. try updating it.

Yes meanwhile I updated to 2.21 and changed some settings for installation.
Will see what happens next time …
Sorry ,was the wrong place to post here …

Seems like a perfectly reasonable place, you can force a gc by running git gc so you don’t have to wait for git to randomly decide it is time.

Thanks !, I made it and got no more errors. Seems to be fixed