diff --git a/SLS_C/build_system/__init__.py b/SLS_C/build_system/__init__.py
index e69de29..3107257 100644
--- a/SLS_C/build_system/__init__.py
+++ b/SLS_C/build_system/__init__.py
@@ -0,0 +1,39 @@
+"""
+Multi-platform build system for C projects.
+
+Supports building for:
+- Linux (native)
+- Windows (native)
+- RP2040 (Raspberry Pi Pico)
+
+Usage:
+    python3 -m build_system [build|run|test|debug|clean] --target=self
+"""
+
+__version__ = "1.0.0"
+
+from .config import get_config, set_config, Config
+from .platform import (
+    Platform,
+    detect_platform,
+    get_platform_name,
+    resolve_target,
+    is_windows,
+    is_linux,
+    is_macos,
+    is_unix
+)
+
+__all__ = [
+    "get_config",
+    "set_config",
+    "Config",
+    "Platform",
+    "detect_platform",
+    "get_platform_name",
+    "resolve_target",
+    "is_windows",
+    "is_linux",
+    "is_macos",
+    "is_unix",
+]
diff --git a/SLS_C/build_system/compilers/__init__.py b/SLS_C/build_system/compilers/__init__.py
index e69de29..533751e 100644
--- a/SLS_C/build_system/compilers/__init__.py
+++ b/SLS_C/build_system/compilers/__init__.py
@@ -0,0 +1,10 @@
+"""
+Compiler implementations for different toolchains.
+"""
+
+from .base import Compiler, CompileResult
+
+__all__ = [
+    "Compiler",
+    "CompileResult",
+]
diff --git a/SLS_C/build_system/targets/__init__.py b/SLS_C/build_system/targets/__init__.py
index e69de29..c669df9 100644
--- a/SLS_C/build_system/targets/__init__.py
+++ b/SLS_C/build_system/targets/__init__.py
@@ -0,0 +1,10 @@
+"""
+Build target implementations for different platforms.
+"""
+
+from .base import Target, BuildType
+
+__all__ = [
+    "Target",
+    "BuildType",
+]