Partial build log
this derivation will be built:
/nix/store/yj9dljwryjdj2qmabfpggdcvfqcvp9yk-gap-4.12-upgrade.patch.drv
building '/nix/store/qm1dlm4h18wc1ih8bf2kh3zyiswbl1lv-gap-4.12-upgrade.patch.drv'...
gap> trying https://git.sagemath.org/sage.git/patch?id2=9.8.beta7&id=dd4a17281adcda74e11f998ef519b6bd0dafb043
gap> % Total % Received % Xferd Average Speed Time Time Time Current
gap> Dload Upload Total Spent Left Speed
gap> 0 9115 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
gap> curl: (22) The requested URL returned error: 404
gap> error checking the existence of file:///dev/null/sha256/sha256-UQT9DO9xd5hh5RucvUkIm+rggPKu8bc1YaSI6LVYH98=:
gap> curl: (37) Couldn't open file /dev/null/sha256/sha256-UQT9DO9xd5hh5RucvUkIm+rggPKu8bc1YaSI6LVYH98=
gap> error: cannot download gap-4.12-upgrade.patch from any mirror
error: builder for '/nix/store/qm1dlm4h18wc1ih8bf2kh3zyiswbl1lv-gap-4.12-upgrade.patch.drv' failed with exit code 1
error: