I took me at least two 40 hour weeks to get my first coin to build under windows.  It took 5 minutes under Linux.  Once you get the environment setup right, it will go easier.

I had this problem as well when I was compiling using gitian. I'm confident theres a better solution but restarting the vm instance that I was running kvm in solved the issue. Likely something to do with residuals left from the previous dependency builds that werent removed correctly wjem they completed.

I stopped digging after the reboot solved the issue.