diff --git a/build.zig b/build.zig
index f46bb9e..06145fc 100644
--- a/build.zig
+++ b/build.zig
@@ -41,12 +41,18 @@ pub fn build(b: *std.Build) !void {
     //     compiler.linkSystemLibrary("msvcrt-os");
     // }
 
+    const fetcher = b.addExecutable(.{
+        .name = "llvm_fetcher",
+        .root_source_file = .{ .path = "build/fetcher.zig" },
+        .target = native_target,
+        .optimize = .Debug,
+        .single_threaded = true,
+    });
     const llvm_version = "17.0.6";
-    var fetcher_run: ?*std.Build.Step.Run = null;
+    const prefix = "nat/cache";
     const llvm_path = b.option([]const u8, "llvm_path", "LLVM prefix path") orelse blk: {
         assert(!self_hosted_ci);
         if (third_party_ci or (!target.query.isNativeOs() or !target.query.isNativeCpu())) {
-            const prefix = "nat/cache";
             var llvm_directory = try std.ArrayListUnmanaged(u8).initCapacity(b.allocator, 128);
             llvm_directory.appendSliceAssumeCapacity(prefix ++ "/");
             llvm_directory.appendSliceAssumeCapacity("llvm-");
@@ -58,30 +64,18 @@ pub fn build(b: *std.Build) !void {
             llvm_directory.appendSliceAssumeCapacity("-");
             llvm_directory.appendSliceAssumeCapacity(@tagName(target.result.abi));
             llvm_directory.appendSliceAssumeCapacity("-");
-            llvm_directory.appendSliceAssumeCapacity(if (std.mem.eql(u8, target.result.cpu.model.name, @tagName(target.result.cpu.arch))) "baseline" else target.result.cpu.model.name);
+            const cpu = if (std.mem.eql(u8, target.result.cpu.model.name, @tagName(target.result.cpu.arch))) "baseline" else target.result.cpu.model.name;
+            llvm_directory.appendSliceAssumeCapacity(cpu);
+
+            const url = try std.mem.concat(b.allocator, u8, &.{"https://github.com/birth-software/fetch-llvm/releases/download/v", llvm_version, "/llvm-", llvm_version, "-", @tagName(target.result.cpu.arch), "-", @tagName(target.result.os.tag), "-", @tagName(target.result.abi), "-", cpu, ".tar.xz"});
 
             var dir = std.fs.cwd().openDir(llvm_directory.items, .{}) catch {
-                const llvm_fetcher = b.addExecutable(.{
-                    .name = "llvm_fetcher",
-                    .root_source_file = .{ .path = "build/llvm_fetcher.zig" },
-                    .target = native_target,
-                    .optimize = .ReleaseFast,
-                    .single_threaded = true,
-                });
-                const run = b.addRunArtifact(llvm_fetcher);
-                fetcher_run = run;
+                const run = b.addRunArtifact(fetcher);
+                compiler.step.dependOn(&run.step);
                 run.addArg("-prefix");
                 run.addArg(prefix);
-                run.addArg("-version");
-                run.addArg(llvm_version);
-                run.addArg("-arch");
-                run.addArg(@tagName(target.result.cpu.arch));
-                run.addArg("-os");
-                run.addArg(@tagName(target.result.os.tag));
-                run.addArg("-abi");
-                run.addArg(@tagName(target.result.abi));
-                run.addArg("-cpu");
-                run.addArg(target.result.cpu.model.name);
+                run.addArg("-url");
+                run.addArg(url);
                 break :blk llvm_directory.items;
             };
 
@@ -97,10 +91,25 @@ pub fn build(b: *std.Build) !void {
         }
     };
 
-    if (fetcher_run) |fr| {
-        compiler.step.dependOn(&fr.step);
+    if (os == .linux) {
+        const directory = "musl-libc-main";
+        var maybe_dir = std.fs.cwd().openDir(prefix ++ "/" ++ directory, .{});
+        _ = &maybe_dir;
+        if (maybe_dir) |*dir| {
+            dir.close();
+        } else |err| {
+            _ = &err; // autofix
+            const url = "https://github.com/birth-software/musl-libc/archive/refs/heads/main.tar.gz";
+            const run = b.addRunArtifact(fetcher);
+            compiler.step.dependOn(&run.step);
+            run.addArg("-prefix");
+            run.addArg(prefix);
+            run.addArg("-url");
+            run.addArg(url);
+        }
     }
 
+
     const llvm_include_dir = try std.mem.concat(b.allocator, u8, &.{ llvm_path, "/include" });
     const llvm_lib_dir = try std.mem.concat(b.allocator, u8, &.{ llvm_path, "/lib" });
     compiler.addIncludePath(std.Build.LazyPath.relative(llvm_include_dir));
@@ -415,7 +424,7 @@ pub fn build(b: *std.Build) !void {
         debug_command.addArgs(args);
         test_command.addArgs(args);
     }
-    //
+    
     // const tests = b.addTest(.{
     //     .name = "nat_test",
     //     .root_source_file = .{ .path = "bootstrap/main.zig" },
diff --git a/build/fetcher.zig b/build/fetcher.zig
new file mode 100644
index 0000000..0ac2330
--- /dev/null
+++ b/build/fetcher.zig
@@ -0,0 +1,97 @@
+const std = @import("std");
+const equal = std.mem.eql;
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    const allocator = arena.allocator();
+    const arguments = try std.process.argsAlloc(allocator);
+    var url_arg: ?[:0]const u8 = null;
+    var prefix_arg: [:0]const u8 = "nat";
+
+    const State = enum{
+        none,
+        prefix,
+        url,
+    };
+
+    var state = State.none;
+
+
+    for (arguments[1..]) |argument| {
+        switch (state) {
+            .none => {
+                if (equal(u8, argument, "-prefix")) {
+                    state = .prefix;
+                } else if (equal(u8, argument, "-url")) {
+                    state = .url;
+                } else return error.InvalidInput;
+            },
+            .prefix => {
+                prefix_arg = argument;
+                state = .none;
+            },
+            .url => {
+                url_arg = argument;
+                state = .none;
+            },
+        }
+    }
+
+    const url = url_arg orelse return error.InvalidInput;
+    const prefix = prefix_arg;
+
+    if (state != .none) return error.InvalidInput;
+
+    const dot_index = std.mem.lastIndexOfScalar(u8, url, '.') orelse return error.InvalidInput;
+    const extension_string = url[dot_index + 1..];
+    const Extension = enum{
+        xz,
+        gz,
+        zip,
+    };
+    const extension: Extension = inline for (@typeInfo(Extension).Enum.fields) |field| {
+        if (std.mem.eql(u8, field.name, extension_string)) {
+            break @enumFromInt(field.value);
+        }
+    } else return error.InvalidInput;
+
+    const uri = try std.Uri.parse(url);
+    var http_client = std.http.Client{
+        .allocator = allocator,
+    };
+    defer http_client.deinit();
+
+    var buffer: [16*1024]u8 = undefined;
+    var request = try http_client.open(.GET, uri, .{
+        .server_header_buffer = &buffer,
+    });
+    defer request.deinit();
+    try request.send(.{});
+    try request.wait();
+
+    if (request.response.status != .ok) {
+        @panic("Failure when fetching TAR");
+        //std.debug.panic("Status: {s} when fetching TAR {s}", .{@tagName(request.response.status), url});
+    }
+
+    var decompressed_buffer = std.ArrayList(u8).init(allocator);
+
+    switch (extension) {
+        .xz => {
+            var decompression = try std.compress.xz.decompress(allocator, request.reader());
+            defer decompression.deinit();
+            try decompression.reader().readAllArrayList(&decompressed_buffer, std.math.maxInt(u32));
+        },
+        .gz => {
+            var decompression = std.compress.gzip.decompressor(request.reader());
+            try decompression.reader().readAllArrayList(&decompressed_buffer, std.math.maxInt(u32));
+        },
+        else => |t| @panic(@tagName(t)),
+    }
+
+    var memory_stream = std.io.fixedBufferStream(decompressed_buffer.items);
+    const directory = try std.fs.cwd().makeOpenPath(prefix, .{});
+    try std.tar.pipeToFileSystem(directory, memory_stream.reader(), .{
+        .mode_mode = .ignore,
+    });
+}
diff --git a/build/llvm_fetcher.zig b/build/llvm_fetcher.zig
deleted file mode 100644
index 0db85d8..0000000
--- a/build/llvm_fetcher.zig
+++ /dev/null
@@ -1,113 +0,0 @@
-const std = @import("std");
-const equal = std.mem.eql;
-
-pub fn main() !void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    const allocator = arena.allocator();
-    const arguments = try std.process.argsAlloc(allocator);
-    var arch_arg: ?std.Target.Cpu.Arch = null;
-    var os_arg: ?std.Target.Os.Tag = null;
-    var abi_arg: ?std.Target.Abi = null;
-    var cpu_arg: [:0]const u8 = "baseline";
-    var version_arg: ?[]const u8 = null;
-    var prefix_arg: [:0]const u8 = "nat";
-
-    const State = enum{
-        none,
-        prefix,
-        version,
-        arch,
-        os,
-        abi,
-        cpu,
-    };
-
-    var state = State.none;
-
-    for (arguments[1..]) |argument| {
-        switch (state) {
-            .none => {
-                if (equal(u8, argument, "-prefix")) {
-                    state = .prefix;
-                } else if (equal(u8, argument, "-version")) {
-                    state = .version;
-                } else if (equal(u8, argument, "-arch")) {
-                    state = .arch;
-                } else if (equal(u8, argument, "-os")) {
-                    state = .os;
-                } else if (equal(u8, argument, "-abi")) {
-                    state = .abi;
-                } else if (equal(u8, argument, "-cpu")) {
-                    state = .cpu;
-                } else return error.InvalidInput;
-            },
-            .prefix => {
-                prefix_arg = argument;
-                state = .none;
-            },
-            .version => {
-                version_arg = argument;
-                state = .none;
-            },
-            .arch => {
-                arch_arg = std.meta.stringToEnum(std.Target.Cpu.Arch, argument) orelse return error.InvalidInput;
-                state = .none;
-            },
-            .os => {
-                os_arg = std.meta.stringToEnum(std.Target.Os.Tag, argument) orelse return error.InvalidInput;
-                state = .none;
-            },
-            .abi => {
-                abi_arg = std.meta.stringToEnum(std.Target.Abi, argument) orelse return error.InvalidInput;
-                state = .none;
-            },
-            .cpu => {
-                cpu_arg = argument;
-                state = .none;
-            },
-        }
-    }
-
-    const version = version_arg orelse return error.InvalidInput;
-    const arch = arch_arg orelse return error.InvalidInput;
-    const os = os_arg orelse return error.InvalidInput;
-    const abi = abi_arg orelse return error.InvalidInput;
-    const cpu = cpu_arg;
-    const prefix = prefix_arg;
-
-    if (state != .none) return error.InvalidInput;
-
-    const url = try std.mem.concat(allocator, u8, &.{"https://github.com/birth-software/fetch-llvm/releases/download/v", version, "/llvm-", version, "-", @tagName(arch), "-", @tagName(os), "-", @tagName(abi), "-", cpu, ".tar.xz"});
-    const uri = try std.Uri.parse(url);
-    var http_client = std.http.Client{
-        .allocator = allocator,
-    };
-    defer http_client.deinit();
-
-    var headers = std.http.Headers{
-        .allocator = allocator,
-    };
-    defer headers.deinit();
-
-    var request = try http_client.open(.GET, uri, headers, .{});
-    defer request.deinit();
-    try request.send(.{});
-    try request.wait();
-
-    if (request.response.status != .ok) {
-        @panic("Failure when fetching TAR");
-        //std.debug.panic("Status: {s} when fetching TAR {s}", .{@tagName(request.response.status), url});
-    }
-
-    var decompression = try std.compress.xz.decompress(allocator, request.reader());
-    defer decompression.deinit();
-
-    var decompressed_buffer = std.ArrayList(u8).init(allocator);
-    try decompression.reader().readAllArrayList(&decompressed_buffer, std.math.maxInt(u32));
-
-    var memory_stream = std.io.fixedBufferStream(decompressed_buffer.items);
-    const directory = try std.fs.cwd().makeOpenPath(prefix, .{});
-    try std.tar.pipeToFileSystem(directory, memory_stream.reader(), .{
-        .mode_mode = .ignore,
-    });
-}