Urand compile fails on Windows

[rustomax]

$ nimble install npg
Downloading https://github.com/rustomax/npg using git
Verifying dependencies for npg@0.1.0
Installing passgen@>= 0.1.0
Downloading https://github.com/rustomax/nim-passgen using git
Verifying dependencies for passgen@0.1.0
Installing urand@>= 0.1.0
Downloading https://github.com/Matceporial/nim-urand using git
Verifying dependencies for urand@0.1.0
Installing urand@0.1.0
Success: urand installed successfully.
Installing passgen@0.1.0
Success: passgen installed successfully.
Installing npg@0.1.0
Building npg/npg.exe using c backend
.nimble\pkgs\urand-0.1.0\urand.nim(61, 29) Error: initialization not allowed here
Prompt: Build failed for 'npg@0.1.0', would you like to try installing 'npg@#head' (latest unstable)? [y/N]
Answer: y
Downloading https://github.com/rustomax/npg using git
Verifying dependencies for npg@#head
Info: Dependency on passgen@>= 0.1.0 already satisfied
Verifying dependencies for passgen@0.1.0
Info: Dependency on urand@>= 0.1.0 already satisfied
Verifying dependencies for urand@0.1.0
Installing npg@#head
Building npg/npg.exe using c backend
.nimble\pkgs\urand-0.1.0\urand.nim(61, 29) Error: initialization not allowed here
Tip: 26 messages have been suppressed, use --verbose to show them.
Error: Build failed for package: npg
... Execution failed with exit code 1
... Command: .nimble\bin\nim.exe c --colors:on --noNimblePath -d:release -d:NimblePkgVersion=0.1.0 --path:.nimble\pkgs\passgen-0.1.0 --path:.nimble\pkgs\urand-0.1.0 --hints:off -o:AppData\Local\Temp\nimble_17884\githubcom_rustomaxnpg_#head\npg.exe AppData\Local\Temp\nimble_17884\githubcom_rustomaxnpg_#head\src\npg.nim

[ringabout]

may be related
icyphox/nanoid.nim#1

It seems that the issue is caused by CryptGenRandom being deprecated: https://docs.microsoft.com/en-us/windows/desktop/api/wincrypt/nf-wincrypt-cryptgenrandom. It must be missing in my Windows 10 Insider build.
nim-random uses it for urandom on Windows: https://github.com/oprypin/nim-random#randomurandom
Why can't we switch to the random module from stdlib?

Now you can try std/sysrand, though it is on devel and expermental.
nim-lang/Nim#16459

[rustomax]

@xflywind correct, I didn't want use random from stdlib because of known quality issues. See for instance, https://forum.nim-lang.org/t/6843#42756. I'll look into what's available when I get the chance. Thanks for the pointer to std/sysrand.

[rustomax]

Did a major rework of nim-passgen library that NPG is based on to use nimcrypto random number generator. This enabled a much wider platform support, including Windows, Linux, MacOS and some versions of BSD.