Haskell.nix: error: The Nixpkgs package set does not contain the package: m (system dependency).

[o1lo01ol1o]

Hi, started a project with this as a dependency using haskell.nix, but something in hgeometry is trying to pull in a dependency called "m" that my system is unable to find. Do you have any idea what this might be?

[lemmih]

libm, maybe? You might be better off asking in nix discord or nix IRC.

[o1lo01ol1o]

@lemmih Do you know which hgeometry component depends on libm? Should the corrresponding cabal file not contain something like the following?

if os(windows)
      extra-libraries:
        libm
    else
      if os(darwin)
        extra-libraries:
          libm
      else
        pkgconfig-depends:
          libm

[lemmih]

All Haskell code compiled with GHC uses libm. This is not an hgeometry issue; It's a nix issue. I suggest you ask in the nix discord or IRC servers.

[o1lo01ol1o]

@lemmih I was directed to here by the haskell.nix IRC channel when I was trying to determine if the above referenced error was a referring to something in the haskell.nix infrastructure.

The error is an issue with hgeometry and haskell.nix; other dependencies compile.

[lemmih]

Well, I can promise you it's not an hgeometry issue. But feel free to post the solution here when you find it.

[ramirez7]

@o1lo01ol1o I ran into this issue too and fixed it.

I just added m to my package set with this overlay:

self: super:

{
  m = self.stdenv.mkDerivation {
    name = "m";
    unpackPhase = "true";
    installPhase = "mkdir -p $out";
  };
}

I made an issue with haskell.nix here.

[ramirez7]

@o1lo01ol1o When x-compiling to Windows (mingwW64), remote-iserv failed due to issues opening files/creating directories with libm. I was able to get hgeometry x-compiling by tweaking my overlay to create lib and bin dirs:

self: super:

{
  m = self.stdenv.mkDerivation {
    name = "m";
    unpackPhase = "true";
    # We have to create lib and bin to make it "look like"
    # a library
    installPhase = ''
    mkdir -p $out/lib
    mkdir -p $out/bin
    '';
  };
}

[ramirez7]

FYI @o1lo01ol1o @peterbecich input-output-hk/haskell.nix#1453 fixes this issue upstream. I confirmed on haskell.nix HEAD with ghc923 that hgeometry now works 👍