[nix] add openblas + nixpkgs-fmt

nix/pkgs.nix

-{ pkgs ? import (if builtins.elem builtins.currentSystem ["x86_64-darwin" "aarch64-darwin"]
-                 then ./pinned-25.05.darwin.nix
-                 else ./pinned-25.05.nix) {} }:
+{ pkgs ? import
+    (if builtins.elem builtins.currentSystem [ "x86_64-darwin" "aarch64-darwin" ]
+    then ./pinned-25.05.darwin.nix
+    else ./pinned-25.05.nix)
+    { }
+}:
 
 rec {
   inherit pkgs;
   ghc966 = pkgs.haskell.compiler.ghc966;
   cabal_install = pkgs.haskell.lib.compose.justStaticExecutables pkgs.haskell.packages.ghc966.cabal-install;
-  
-  graphviz = pkgs.callPackage ./graphviz.nix {};
-  igraph_0_10_4 = pkgs.callPackage ./igraph.nix {};
-  corenlp = pkgs.callPackage ./corenlp.nix { };  # 4.5.8
+
+  graphviz = pkgs.callPackage ./graphviz.nix { };
+  igraph_0_10_4 = pkgs.callPackage ./igraph.nix { };
+  corenlp = pkgs.callPackage ./corenlp.nix { }; # 4.5.8
   cabal2stack = pkgs.callPackage ./cabal2stack.nix { ghc = ghc966; };
   nng_notls = pkgs.nng.overrideAttrs (old: {
-    cmakeFlags = (old.cmakeFlags or []) ++ [ "-DNNG_ENABLE_TLS=OFF" ];
+    cmakeFlags = (old.cmakeFlags or [ ]) ++ [ "-DNNG_ENABLE_TLS=OFF" ];
   });
-  
+
   hsBuildInputs = [
     ghc966
     cabal_install
@@ -47,7 +50,8 @@ rec {
     libpqxx
     libsodium
     nng_notls
-    nil  # nix language server
+    nil # nix language server
+    openblas
     pcre
     pkg-config
     postgresql
@@ -55,10 +59,9 @@ rec {
     xz
     zlib
     zeromq
-    curl
-  ] ++ ( lib.optionals stdenv.isDarwin [
-       darwin.apple_sdk.frameworks.Accelerate
-       ]);
+  ] ++ (lib.optionals stdenv.isDarwin [
+    darwin.apple_sdk.frameworks.Accelerate
+  ]);
   libPaths = pkgs.lib.makeLibraryPath nonhsBuildInputs;
   shellHook = ''
     export LD_LIBRARY_PATH="${pkgs.gfortran.cc.lib}:${libPaths}:$LD_LIBRARY_PATH"