Add vendor infrastructure

etc/nix/openblas.nix

@@ -20,6 +20,8 @@ in
 
 {
 
+  pkg = myopenblas;
+
   buildInputs = with pkgs; [
     myopenblas
     scalapack

etc/nix/vendor-shell.nix

@@ -0,0 +1,27 @@
+rec {
+
+  directory = "vendor";
+  src = ''
+
+    _add_vendor_cpath () {
+      export CPATH=$CPATH:$1
+      mkdir -p ${directory}/include
+      ln -frs $1/* ${directory}/include/
+    }
+
+    _add_vendor_lib () {
+      mkdir -p ${directory}/lib
+      ln -frs $1/* ${directory}/lib/
+    }
+
+  '';
+
+  cpath = path: ''
+    _add_vendor_cpath ${path}
+  '';
+
+  lib = path: ''
+    _add_vendor_lib ${path}
+  '';
+
+}