diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dca1103
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-out/
+.zig-cache/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..af96aa6
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,285 @@
+const std = @import("std");
+
+// Although this function looks imperative, it does not perform the build
+// directly and instead it mutates the build graph (`b`) that will be then
+// executed by an external runner. The functions in `std.Build` implement a DSL
+// for defining build steps and express dependencies between them, allowing the
+// build runner to parallelize the build automatically (and the cache system to
+// know when a step doesn't need to be re-run).
+pub fn build(b: *std.Build) void {
+    // Standard target options allow the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+    // Standard optimization options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+    // set a preferred release mode, allowing the user to decide how to optimize.
+    const optimize = b.standardOptimizeOption(.{});
+    // It's also possible to define more custom flags to toggle optional features
+    // of this build script using `b.option()`. All defined flags (including
+    // target and optimize options) will be listed when running `zig build --help`
+    // in this directory.
+
+    // We need to use curl for this as the domain doesn't work with zig TLS
+    const model_step = DownloadStep("https://www.link.cs.cmu.edu/link/ftp-site/link-grammar/link-4.1b/unix/link-4.1b.tar.gz").create(b);
+
+    // This creates a module, which represents a collection of source files alongside
+    // some compilation options, such as optimization mode and linked system libraries.
+    // Zig modules are the preferred way of making Zig code available to consumers.
+    // addModule defines a module that we intend to make available for importing
+    // to our consumers. We must give it a name because a Zig package can expose
+    // multiple modules and consumers will need to be able to specify which
+    // module they want to access.
+    const mod = b.addModule("pos", .{
+        // The root source file is the "entry point" of this module. Users of
+        // this module will only be able to access public declarations contained
+        // in this file, which means that if you have declarations that you
+        // intend to expose to consumers that were defined in other files part
+        // of this module, you will have to make sure to re-export them from
+        // the root file.
+        .root_source_file = b.path("src/root.zig"),
+        // Later on we'll use this module as the root module of a test executable
+        // which requires us to specify a target.
+        .target = target,
+    });
+
+    // Here we define an executable. An executable needs to have a root module
+    // which needs to expose a `main` function. While we could add a main function
+    // to the module defined above, it's sometimes preferable to split business
+    // business logic and the CLI into two separate modules.
+    //
+    // If your goal is to create a Zig library for others to use, consider if
+    // it might benefit from also exposing a CLI tool. A parser library for a
+    // data serialization format could also bundle a CLI syntax checker, for example.
+    //
+    // If instead your goal is to create an executable, consider if users might
+    // be interested in also being able to embed the core functionality of your
+    // program in their own executable in order to avoid the overhead involved in
+    // subprocessing your CLI tool.
+    //
+    // If neither case applies to you, feel free to delete the declaration you
+    // don't need and to put everything under a single module.
+    const exe = b.addExecutable(.{
+        .name = "pos",
+        .root_module = b.createModule(.{
+            // b.createModule defines a new module just like b.addModule but,
+            // unlike b.addModule, it does not expose the module to consumers of
+            // this package, which is why in this case we don't have to give it a name.
+            .root_source_file = b.path("src/main.zig"),
+            // Target and optimization levels must be explicitly wired in when
+            // defining an executable or library (in the root module), and you
+            // can also hardcode a specific target for an executable or library
+            // definition if desireable (e.g. firmware for embedded devices).
+            .target = target,
+            .optimize = optimize,
+            // List of modules available for import in source files part of the
+            // root module.
+            .imports = &.{
+                // Here "pos" is the name you will use in your source code to
+                // import this module (e.g. `@import("pos")`). The name is
+                // repeated because you are allowed to rename your imports, which
+                // can be extremely useful in case of collisions (which can happen
+                // importing modules from different packages).
+                .{ .name = "pos", .module = mod },
+            },
+        }),
+    });
+
+    exe.step.dependOn(&model_step.step);
+    // This declares intent for the executable to be installed into the
+    // install prefix when running `zig build` (i.e. when executing the default
+    // step). By default the install prefix is `zig-out/` but can be overridden
+    // by passing `--prefix` or `-p`.
+    b.installArtifact(exe);
+
+    // This creates a top level step. Top level steps have a name and can be
+    // invoked by name when running `zig build` (e.g. `zig build run`).
+    // This will evaluate the `run` step rather than the default step.
+    // For a top level step to actually do something, it must depend on other
+    // steps (e.g. a Run step, as we will see in a moment).
+    const run_step = b.step("run", "Run the app");
+
+    // This creates a RunArtifact step in the build graph. A RunArtifact step
+    // invokes an executable compiled by Zig. Steps will only be executed by the
+    // runner if invoked directly by the user (in the case of top level steps)
+    // or if another step depends on it, so it's up to you to define when and
+    // how this Run step will be executed. In our case we want to run it when
+    // the user runs `zig build run`, so we create a dependency link.
+    const run_cmd = b.addRunArtifact(exe);
+    run_step.dependOn(&run_cmd.step);
+
+    // By making the run step depend on the default step, it will be run from the
+    // installation directory rather than directly from within the cache directory.
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    // This allows the user to pass arguments to the application in the build
+    // command itself, like this: `zig build run -- arg1 arg2 etc`
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    // Creates an executable that will run `test` blocks from the provided module.
+    // Here `mod` needs to define a target, which is why earlier we made sure to
+    // set the releative field.
+    const mod_tests = b.addTest(.{
+        .root_module = mod,
+    });
+    exe.step.dependOn(&model_step.step);
+
+    // A run step that will run the test executable.
+    const run_mod_tests = b.addRunArtifact(mod_tests);
+
+    // Creates an executable that will run `test` blocks from the executable's
+    // root module. Note that test executables only test one module at a time,
+    // hence why we have to create two separate ones.
+    const exe_tests = b.addTest(.{
+        .root_module = exe.root_module,
+    });
+
+    // A run step that will run the second test executable.
+    const run_exe_tests = b.addRunArtifact(exe_tests);
+
+    // A top level step for running all tests. dependOn can be called multiple
+    // times and since the two run steps do not depend on one another, this will
+    // make the two of them run in parallel.
+    const test_step = b.step("test", "Run tests");
+    test_step.dependOn(&run_mod_tests.step);
+    test_step.dependOn(&run_exe_tests.step);
+
+    // Just like flags, top level steps are also listed in the `--help` menu.
+    //
+    // The Zig build system is entirely implemented in userland, which means
+    // that it cannot hook into private compiler APIs. All compilation work
+    // orchestrated by the build system will result in other Zig compiler
+    // subcommands being invoked with the right flags defined. You can observe
+    // these invocations when one fails (or you pass a flag to increase
+    // verbosity) to validate assumptions and diagnose problems.
+    //
+    // Lastly, the Zig build system is relatively simple and self-contained,
+    // and reading its source code will allow you to master it.
+}
+
+fn DownloadStep(comptime link: []const u8) type {
+    return struct {
+        step: std.Build.Step,
+        builder: *std.Build,
+
+        const download_link = link;
+        const download_uri = std.Uri.parse(link) catch @compileError("download link is not a valid Uri");
+        const file_type: enum {
+            targz,
+            zip,
+        } = if (std.mem.endsWith(u8, link, ".tar.gz")) .targz else if (std.mem.endsWith(u8, link, "zip")) .zip else @compileError("can only download tar.gz or zip files");
+
+        const Self = @This();
+
+        fn fileName(uri: std.Uri) []const u8 {
+            const path = switch (uri.path) {
+                .raw => |r| r,
+                .percent_encoded => |p| p,
+            };
+            var it = std.mem.splitBackwardsScalar(u8, path, '/');
+            return it.first();
+        }
+
+        fn fileNameNoExtension() []const u8 {
+            const file_name = fileName(download_uri);
+            return switch (file_type) {
+                .targz => file_name[0..std.mem.lastIndexOf(u8, file_name, ".tar.gz").?],
+                .zip => file_name[0..std.mem.lastIndexOf(u8, file_name, ".zip").?],
+            };
+        }
+
+        pub fn create(builder: *std.Build) *Self {
+            const self = builder.allocator.create(Self) catch @panic("OOM");
+            self.* = .{
+                .step = std.Build.Step.init(.{
+                    .id = .custom,
+                    .name = "download-model",
+                    .owner = builder,
+                    .makeFn = make,
+                }),
+                .builder = builder,
+            };
+            return self;
+        }
+
+        pub fn getOutputPath(self: *Self) std.Build.LazyPath {
+            var hasher = std.hash.Wyhash.init(0);
+            hasher.update(download_link);
+            const cache_hash = hasher.final();
+
+            var cache_dir_buf: [std.fs.max_path_bytes]u8 = undefined;
+            const cache_dir = std.fmt.bufPrint(&cache_dir_buf, "{s}/o/{x}/{s}", .{ self.builder.cache_root.path.?, cache_hash, fileNameNoExtension() }) catch @panic("path too long");
+
+            return .{ .cwd_relative = self.builder.allocator.dupe(u8, cache_dir) catch @panic("OOM") };
+        }
+
+        fn make(step: *std.Build.Step, options: std.Build.Step.MakeOptions) anyerror!void {
+            _ = options;
+            const self: *Self = @fieldParentPtr("step", step);
+
+            const model_dir = fileNameNoExtension();
+
+            // Create a cache hash based on the URL
+            var hasher = std.hash.Wyhash.init(0);
+            hasher.update(link);
+            const cache_hash = hasher.final();
+
+            var cache_dir_buf: [std.fs.max_path_bytes]u8 = undefined;
+            const cache_dir = std.fmt.bufPrint(&cache_dir_buf, "{s}/o/{x}", .{ self.builder.cache_root.path.?, cache_hash }) catch @panic("path too long");
+
+            const cached_model_dir = std.fmt.allocPrint(
+                self.builder.allocator,
+                "{s}/{s}",
+                .{ cache_dir, model_dir },
+            ) catch @panic("OOM");
+            defer self.builder.allocator.free(cached_model_dir);
+
+            // Check if already cached
+            if (std.fs.cwd().access(cached_model_dir, .{})) |_| {
+                step.result_cached = true;
+                return;
+            } else |_| {}
+
+            // Not cached, need to download
+            std.fs.cwd().makePath(cache_dir) catch @panic("Could not create cache directory");
+
+            const archive = std.fmt.allocPrint(
+                self.builder.allocator,
+                "{s}/{s}",
+                .{ cache_dir, fileName(download_uri) },
+            ) catch @panic("OOM");
+            defer self.builder.allocator.free(archive);
+
+            // Download
+            const download_result = std.process.Child.run(.{
+                .allocator = self.builder.allocator,
+                .argv = &.{ "curl", "-s", "-o", archive, link },
+            }) catch return error.DownloadFailed;
+            if (download_result.term.Exited != 0) return error.DownloadFailed;
+
+            switch (file_type) {
+                .zip => {
+                    // Extract to cache using stdlib
+                    var zip_file = std.fs.cwd().openFile(archive, .{}) catch return error.UnzipFailed;
+                    defer zip_file.close();
+
+                    var cache_dir_handle = std.fs.cwd().openDir(cache_dir, .{}) catch return error.UnzipFailed;
+                    defer cache_dir_handle.close();
+
+                    var zip_file_buffer: [4096]u8 = undefined;
+                    var zip_file_reader = zip_file.reader(&zip_file_buffer);
+
+                    std.zip.extract(cache_dir_handle, &zip_file_reader, .{}) catch return error.UnzipFailed;
+
+                    step.result_cached = false;
+                },
+                .targz => {
+                    @compileError("tar.gz extraction not yet implemented");
+                },
+            }
+        }
+    };
+}
diff --git a/build.zig.zon b/build.zig.zon
new file mode 100644
index 0000000..29fa25a
--- /dev/null
+++ b/build.zig.zon
@@ -0,0 +1,81 @@
+.{
+    // This is the default name used by packages depending on this one. For
+    // example, when a user runs `zig fetch --save <url>`, this field is used
+    // as the key in the `dependencies` table. Although the user can choose a
+    // different name, most users will stick with this provided value.
+    //
+    // It is redundant to include "zig" in this name because it is already
+    // within the Zig package namespace.
+    .name = .pos,
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+    // Together with name, this represents a globally unique package
+    // identifier. This field is generated by the Zig toolchain when the
+    // package is first created, and then *never changes*. This allows
+    // unambiguous detection of one package being an updated version of
+    // another.
+    //
+    // When forking a Zig project, this id should be regenerated (delete the
+    // field and run `zig build`) if the upstream project is still maintained.
+    // Otherwise, the fork is *hostile*, attempting to take control over the
+    // original project's identity. Thus it is recommended to leave the comment
+    // on the following line intact, so that it shows up in code reviews that
+    // modify the field.
+    .fingerprint = 0x80d9e6acc1db9e17, // Changing this has security and trust implications.
+    // Tracks the earliest Zig version that the package considers to be a
+    // supported use case.
+    .minimum_zig_version = "0.15.1",
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL. If the contents of a URL change this will result in a hash mismatch
+        //    // which will prevent zig from using it.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+        //
+        //    // When this is set to `true`, a package is declared to be lazily
+        //    // fetched. This makes the dependency only get fetched if it is
+        //    // actually used.
+        //    .lazy = false,
+        //},
+    },
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package. Only files listed here will remain on disk
+    // when using the zig package manager. As a rule of thumb, one should list
+    // files required for compilation plus any license(s).
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+        // For example...
+        //"LICENSE",
+        //"README.md",
+    },
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..465ad99
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,27 @@
+const std = @import("std");
+const pos = @import("pos");
+
+pub fn main() !void {
+    // Prints to stderr, ignoring potential errors.
+    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
+    try pos.bufferedPrint();
+}
+
+test "simple test" {
+    const gpa = std.testing.allocator;
+    var list: std.ArrayList(i32) = .empty;
+    defer list.deinit(gpa); // Try commenting this out and see if zig detects the memory leak!
+    try list.append(gpa, 42);
+    try std.testing.expectEqual(@as(i32, 42), list.pop());
+}
+
+test "fuzz example" {
+    const Context = struct {
+        fn testOne(context: @This(), input: []const u8) anyerror!void {
+            _ = context;
+            // Try passing `--fuzz` to `zig build test` and see if it manages to fail this test case!
+            try std.testing.expect(!std.mem.eql(u8, "canyoufindme", input));
+        }
+    };
+    try std.testing.fuzz(Context{}, Context.testOne, .{});
+}
diff --git a/src/root.zig b/src/root.zig
new file mode 100644
index 0000000..94c7cd0
--- /dev/null
+++ b/src/root.zig
@@ -0,0 +1,23 @@
+//! By convention, root.zig is the root source file when making a library.
+const std = @import("std");
+
+pub fn bufferedPrint() !void {
+    // Stdout is for the actual output of your application, for example if you
+    // are implementing gzip, then only the compressed bytes should be sent to
+    // stdout, not any debugging messages.
+    var stdout_buffer: [1024]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&stdout_buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("Run `zig build test` to run the tests.\n", .{});
+
+    try stdout.flush(); // Don't forget to flush!
+}
+
+pub fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+test "basic add functionality" {
+    try std.testing.expect(add(3, 7) == 10);
+}