diff --git a/README.md b/README.md
index e8f8dc64829acd6c64698398b740958f7c645296..f0986ea46b013b76095fe99d5ec1a40945d3a41b 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ in your program:
 ```zig
 const std = @import("std");
 const tracer = @import("tracer");
-const build_options = @import("build_options");
+pub const build_options = @import("build_options");
 
 pub const tracer_impl = tracer.spall; // supports none, log, spall out of the box
 
diff --git a/build.zig b/build.zig
index 1eae7a4c64c77acf89e35144da6c88c726182f9b..5e0595221ab3cbfb04f4403800716d9161e2218b 100644
--- a/build.zig
+++ b/build.zig
@@ -4,22 +4,19 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const mode = b.option(std.builtin.Mode, "mode", "") orelse .Debug;
 
+    const mod = b.addModule("tracer", .{ .source_file = .{ .path = "src/mod.zig" } });
+
+    const options = b.addOptions();
+    options.addOption(usize, "src_file_trimlen", std.fs.path.dirname(std.fs.path.dirname(@src().file).?).?.len);
+
     const exe = b.addExecutable(.{
         .name = "test",
         .root_source_file = .{ .path = "src/main.zig" },
         .target = target,
         .optimize = mode,
     });
+    exe.linkLibC();
+    exe.addModule("tracer", mod);
+    exe.addOptions("build_options", options);
     b.installArtifact(exe);
-
-    const run_cmd = b.addRunArtifact(exe);
-
-    run_cmd.step.dependOn(b.getInstallStep());
-
-    if (b.args) |args| {
-        run_cmd.addArgs(args);
-    }
-
-    const run_step = b.step("run", "Run the app");
-    run_step.dependOn(&run_cmd.step);
 }
diff --git a/src/main.zig b/src/main.zig
index f92e18124bb86f9b42fa47ec0a8291c7b0d9ad35..b78557d482999d07cfc3395a35b688b97a75d644 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,5 +1,24 @@
 const std = @import("std");
+const tracer = @import("tracer");
+pub const build_options = @import("build_options");
+
+pub const tracer_impl = tracer.spall;
 
 pub fn main() !void {
-    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
+    try tracer.init();
+    defer tracer.deinit();
+
+    // main loop
+    var go = false;
+    while (go) {
+        try tracer.init2();
+        defer tracer.deinit2();
+
+        handler();
+    }
+}
+
+fn handler() void {
+    const t = tracer.trace(@src());
+    defer t.end();
 }