WIP

overlay.nix

@@ -3,5 +3,37 @@ final: prev:
 # Changes to packages from nixpkgs
 
 {
+  blis = ((prev.blis.override {
+    blas64 = true;
+    withArchitecture = "generic";
+  }).overrideAttrs (old: {
+    nativeBuildInputs = (old.nativeBuildInputs or []) ++ [
+      prev.buildPackages.gfortran
+    ];
+  })).overrideDerivation (old : {
+    configureFlags = [
+      "--enable-cblas"
+      "--blas-int-size=64"
+      "--enable-threading=openmp"
+      #"--build=x86_64-unknown-linux-gnu"
+      #"--host=riscv64-unknown-linux-gnu"
+      "generic"
+    ];
+  });
 
+  unalignedCheck = prev.stdenv.mkDerivation {
+    name = "unaligned-check";
+    src = ./unalign.c;
+    unpackPhase = ''
+      cp ${./unalign.c} unalign.c
+    '';
+    dontConfigure = true;
+    buildPhase = ''
+      $CC unalign.c -o unalign_check
+    '';
+    installPhase = ''
+      mkdir -p $out/bin
+      cp unalign_check $out/bin/
+    '';
+  };
 }