nix build haskell.compiler.ghcHEAD

[Rahul Muttineni]

Hi GHC Devs,

Refer https://github.com/NixOS/nixpkgs/issues/14333 for a problem I was
having when building with nix. The interesting part is that if I add an
extra flag -optl-lpthread manually, the error goes away and the build
succeeds. My question is why the build system didn't add the -optl-lpthread
flag when libpthread was a requirement for that particular build?

Thanks,
Rahul Muttineni
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