diff --git a/.gitignore b/.gitignore
index 18517d4..81575ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 zig-out
-zig-cache
+.zig-cache
 gbdk
\ No newline at end of file
diff --git a/build.zig b/build.zig
index cdd3ae1..30665a5 100644
--- a/build.zig
+++ b/build.zig
@@ -1,18 +1,22 @@
 const std = @import("std");
-const builtin = @import("builtin");
 const utils = @import("utils.zig");
 
 const emulator = "vbam";
 
-pub fn build(b: *std.build.Builder) !void {
-    b.build_root = try utils.root(b.build_root);
+fn buildImpl(b: *std.Build) !void {
+    // Obtenir la racine du projet (cwd lors de l'invocation de zig build)
+    const root_path = try std.process.getCwdAlloc(b.allocator);
+    defer b.allocator.free(root_path);
+
+    // Télécharge + extrait le toolchain GBDK si absent
     try utils.ensure_tar(
         b.allocator,
-        b.build_root,
+        root_path,
         "gbdk",
-        "https://github.com/gbdk-2020/gbdk-2020/releases/download/4.0.6/gbdk-linux64.tar.gz",
+        "https://github.com/gbdk-2020/gbdk-2020/releases/download/4.4.0/gbdk-linux64.tar.gz",
     );
-    const folder = try std.fs.openDirAbsolute(b.build_root, .{});
+
+    const folder = try std.fs.openDirAbsolute(root_path, .{});
     folder.makeDir("zig-out") catch {};
 
     const obj = b.addSystemCommand(&.{
@@ -24,18 +28,25 @@ pub fn build(b: *std.build.Builder) !void {
         "zig-gb.o",
         "../src/main.c",
     });
-    obj.cwd = "zig-out";
+    obj.cwd = b.path("zig-out");
 
     const gb = b.addSystemCommand(&.{
         "../gbdk/bin/lcc", "-Wa-l", "-DUSE_SFR_FOR_REG", "-o", "zig-gb.gb", "zig-gb.o",
     });
-    gb.cwd = "zig-out";
+    gb.cwd = b.path("zig-out");
 
     b.default_step.dependOn(&gb.step);
     gb.step.dependOn(&obj.step);
 
     const run_step = b.step("run", "Run in Visual Boy Advance");
     const vbam = b.addSystemCommand(&.{ emulator, "-F", "zig-out/zig-gb.gb" });
+    vbam.cwd = b.path(".");
     run_step.dependOn(&gb.step);
     run_step.dependOn(&vbam.step);
 }
+
+pub fn build(b: *std.Build) void {
+    buildImpl(b) catch |err| {
+        std.log.err("build failed: {s}", .{@errorName(err)});
+    };
+}
diff --git a/utils.zig b/utils.zig
index 40d918a..9fa24ce 100644
--- a/utils.zig
+++ b/utils.zig
@@ -27,11 +27,14 @@ test "root" {
 
 /// Run shell command
 pub fn exec(allocator: std.mem.Allocator, cwd: []const u8, argv: []const []const u8, opts: Options) !void {
-    var child = try std.ChildProcess.init(argv, allocator);
+    var child = std.process.Child.init(argv, allocator);
     child.cwd = cwd;
-    if (opts.enable_stdout) child.stdout = std.io.getStdOut() else child.stdout = null;
-    if (opts.enable_stderr) child.stderr = std.io.getStdErr() else child.stderr = null;
-    _ = try child.spawnAndWait();
+    // Comportement des flux selon options
+    child.stdin_behavior = .Ignore;
+    child.stdout_behavior = if (opts.enable_stdout) .Inherit else .Ignore;
+    child.stderr_behavior = if (opts.enable_stderr) .Inherit else .Ignore;
+    try child.spawn();
+    _ = try child.wait();
 }
 
 /// Ensure repository exists, if not clone it with git. cwd is absolute path