diff --git a/src/StaticPHP/Package/LibraryPackage.php b/src/StaticPHP/Package/LibraryPackage.php
index 42f60d79..cd8c626e 100644
--- a/src/StaticPHP/Package/LibraryPackage.php
+++ b/src/StaticPHP/Package/LibraryPackage.php
@@ -113,60 +113,6 @@ class LibraryPackage extends Package
         }
     }
 
-    /**
-     * Get extra CFLAGS for current package.
-     * You need to define the environment variable in the format of {LIBRARY_NAME}_CFLAGS
-     * where {LIBRARY_NAME} is the snake_case name of the library.
-     * For example, for libjpeg, the environment variable should be libjpeg_CFLAGS.
-     */
-    public function getLibExtraCFlags(): string
-    {
-        // get environment variable
-        $env = getenv($this->getSnakeCaseName() . '_CFLAGS') ?: '';
-        // get default c flags
-        $arch_c_flags = getenv('SPC_DEFAULT_CFLAGS') ?: '';
-        if (!empty(getenv('SPC_DEFAULT_CFLAGS')) && !str_contains($env, $arch_c_flags)) {
-            $env .= ' ' . $arch_c_flags;
-        }
-        return trim($env);
-    }
-
-    /**
-     * Get extra CXXFLAGS for current package.
-     * You need to define the environment variable in the format of {LIBRARY_NAME}_CXXFLAGS
-     * where {LIBRARY_NAME} is the snake_case name of the library.
-     * For example, for libjpeg, the environment variable should be libjpeg_CXXFLAGS.
-     */
-    public function getLibExtraCxxFlags(): string
-    {
-        // get environment variable
-        $env = getenv($this->getSnakeCaseName() . '_CXXFLAGS') ?: '';
-        // get default cxx flags
-        $arch_cxx_flags = getenv('SPC_DEFAULT_CXXFLAGS') ?: '';
-        if (!empty(getenv('SPC_DEFAULT_CXXFLAGS')) && !str_contains($env, $arch_cxx_flags)) {
-            $env .= ' ' . $arch_cxx_flags;
-        }
-        return trim($env);
-    }
-
-    /**
-     * Get extra LDFLAGS for current package.
-     * You need to define the environment variable in the format of {LIBRARY_NAME}_LDFLAGS
-     * where {LIBRARY_NAME} is the snake_case name of the library.
-     * For example, for libjpeg, the environment variable should be libjpeg_LDFLAGS.
-     */
-    public function getLibExtraLdFlags(): string
-    {
-        // get environment variable
-        $env = getenv($this->getSnakeCaseName() . '_LDFLAGS') ?: '';
-        // get default ld flags
-        $arch_ld_flags = getenv('SPC_DEFAULT_LDFLAGS') ?: '';
-        if (!empty(getenv('SPC_DEFAULT_LDFLAGS')) && !str_contains($env, $arch_ld_flags)) {
-            $env .= ' ' . $arch_ld_flags;
-        }
-        return trim($env);
-    }
-
     /**
      * Patch pkgconfig file prefix, exec_prefix, libdir, includedir for correct build.
      *
@@ -364,17 +310,6 @@ class LibraryPackage extends Package
         return $res['libs'];
     }
 
-    /**
-     * Get extra LIBS for current package.
-     * You need to define the environment variable in the format of {LIBRARY_NAME}_LIBS
-     * where {LIBRARY_NAME} is the snake_case name of the library.
-     * For example, for libjpeg, the environment variable should be libjpeg_LIBS.
-     */
-    public function getLibExtraLibs(): string
-    {
-        return getenv($this->getSnakeCaseName() . '_LIBS') ?: '';
-    }
-
     /**
      * Get tar compress options from suffix
      *
diff --git a/src/StaticPHP/Package/Package.php b/src/StaticPHP/Package/Package.php
index b3f8ccb6..ba53f81d 100644
--- a/src/StaticPHP/Package/Package.php
+++ b/src/StaticPHP/Package/Package.php
@@ -284,6 +284,71 @@ abstract class Package
         return $this->getArtifact()?->hasPlatformBinary() ?? false;
     }
 
+    /**
+     * Get extra CFLAGS for current package.
+     * You need to define the environment variable in the format of {PACKAGE_NAME}_CFLAGS
+     * where {PACKAGE_NAME} is the snake_case name of the package.
+     * For example, for libjpeg, the environment variable should be libjpeg_CFLAGS.
+     */
+    public function getLibExtraCFlags(): string
+    {
+        // get environment variable
+        $env = getenv($this->getSnakeCaseName() . '_CFLAGS') ?: '';
+        // get default c flags
+        $arch_c_flags = getenv('SPC_DEFAULT_CFLAGS') ?: '';
+        if (!empty(getenv('SPC_DEFAULT_CFLAGS')) && !str_contains($env, $arch_c_flags)) {
+            $env .= ' ' . $arch_c_flags;
+        }
+        return trim($env);
+    }
+
+    /**
+     * Get extra CXXFLAGS for current package.
+     * You need to define the environment variable in the format of {PACKAGE_NAME}_CXXFLAGS
+     * where {PACKAGE_NAME} is the snake_case name of the package.
+     * For example, for libjpeg, the environment variable should be libjpeg_CXXFLAGS.
+     */
+    public function getLibExtraCxxFlags(): string
+    {
+        // get environment variable
+        $env = getenv($this->getSnakeCaseName() . '_CXXFLAGS') ?: '';
+        // get default cxx flags
+        $arch_cxx_flags = getenv('SPC_DEFAULT_CXXFLAGS') ?: '';
+        if (!empty(getenv('SPC_DEFAULT_CXXFLAGS')) && !str_contains($env, $arch_cxx_flags)) {
+            $env .= ' ' . $arch_cxx_flags;
+        }
+        return trim($env);
+    }
+
+    /**
+     * Get extra LDFLAGS for current package.
+     * You need to define the environment variable in the format of {PACKAGE_NAME}_LDFLAGS
+     * where {PACKAGE_NAME} is the snake_case name of the package.
+     * For example, for libjpeg, the environment variable should be libjpeg_LDFLAGS.
+     */
+    public function getLibExtraLdFlags(): string
+    {
+        // get environment variable
+        $env = getenv($this->getSnakeCaseName() . '_LDFLAGS') ?: '';
+        // get default ld flags
+        $arch_ld_flags = getenv('SPC_DEFAULT_LDFLAGS') ?: '';
+        if (!empty(getenv('SPC_DEFAULT_LDFLAGS')) && !str_contains($env, $arch_ld_flags)) {
+            $env .= ' ' . $arch_ld_flags;
+        }
+        return trim($env);
+    }
+
+    /**
+     * Get extra LIBS for current package.
+     * You need to define the environment variable in the format of {PACKAGE_NAME}_LIBS
+     * where {PACKAGE_NAME} is the snake_case name of the package.
+     * For example, for libjpeg, the environment variable should be libjpeg_LIBS.
+     */
+    public function getLibExtraLibs(): string
+    {
+        return getenv($this->getSnakeCaseName() . '_LIBS') ?: '';
+    }
+
     /**
      * Get the snake_case name of the package.
      */
diff --git a/src/StaticPHP/Package/PackageBuilder.php b/src/StaticPHP/Package/PackageBuilder.php
index 582fa474..943b3ce5 100644
--- a/src/StaticPHP/Package/PackageBuilder.php
+++ b/src/StaticPHP/Package/PackageBuilder.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace StaticPHP\Package;
 
+use StaticPHP\Artifact\ArtifactCache;
 use StaticPHP\Config\PackageConfig;
 use StaticPHP\DI\ApplicationContext;
 use StaticPHP\Exception\SPCException;
@@ -39,8 +40,8 @@ class PackageBuilder
     public function buildPackage(Package $package, bool $force = false): int
     {
         // init build dirs
-        if (!$package instanceof LibraryPackage) {
-            throw new SPCInternalException('Please, never try to build non-library packages directly.');
+        if (!$package instanceof LibraryPackage && !$package instanceof ToolPackage) {
+            throw new SPCInternalException('Please, never try to build non-library, non-tool packages directly.');
         }
         FileSystem::createDir($package->getBuildRootPath());
         FileSystem::createDir($package->getIncludeDir());
@@ -78,6 +79,14 @@ class PackageBuilder
                     $this->installLicense($package, $license);
                 }
             }
+
+            // Record the installed version for tool packages built from source, so
+            // `check-update --installed` reflects what's actually on disk (mirrors the
+            // binary-install recording in PackageInstaller::installBinary()).
+            if ($package instanceof ToolPackage) {
+                $source_info = ApplicationContext::get(ArtifactCache::class)->getSourceInfo($package->getName());
+                ToolVersionRegistry::record($package->getName(), $source_info['version'] ?? null);
+            }
         } catch (SPCException $e) {
             // Ensure package information is bound if not already
             if ($e->getPackageInfo() === null) {
diff --git a/src/StaticPHP/Package/PackageInstaller.php b/src/StaticPHP/Package/PackageInstaller.php
index a5481583..cf93368d 100644
--- a/src/StaticPHP/Package/PackageInstaller.php
+++ b/src/StaticPHP/Package/PackageInstaller.php
@@ -168,9 +168,6 @@ class PackageInstaller
         // Early validation: check if packages can be built or installed before downloading
         $this->validatePackagesBeforeBuild();
 
-        // Check that all required tools are installed before proceeding
-        $this->ensureRequiredTools();
-
         // check download
         if ($this->download) {
             $downloaderOptions = DownloaderOptions::extractFromConsoleOptions($this->options, 'dl');
@@ -178,7 +175,7 @@ class PackageInstaller
             // These must always download binary (not source), regardless of global prefer-source setting.
             $binary_only_packages = array_filter(
                 $this->packages,
-                fn ($p) => $p instanceof LibraryPackage
+                fn ($p) => ($p instanceof LibraryPackage || $p instanceof ToolPackage)
                     && !$this->isBuildPackage($p)
                     && !$p->hasStage('build')
                     && ($p->getArtifact()?->hasPlatformBinary() ?? false)
@@ -216,8 +213,8 @@ class PackageInstaller
         $builder = ApplicationContext::get(PackageBuilder::class);
         foreach ($this->packages as $package) {
             $is_to_build = $this->isBuildPackage($package);
-            $has_build_stage = $package instanceof LibraryPackage && $package->hasStage('build');
-            $should_use_binary = $package instanceof LibraryPackage && ($package->getArtifact()?->shouldUseBinary() ?? false);
+            $has_build_stage = ($package instanceof LibraryPackage || $package instanceof ToolPackage) && $package->hasStage('build');
+            $should_use_binary = ($package instanceof LibraryPackage || $package instanceof ToolPackage) && ($package->getArtifact()?->shouldUseBinary() ?? false);
             $has_source = $package->hasSource();
             if (!$is_to_build && $should_use_binary) {
                 // install binary
@@ -280,6 +277,11 @@ class PackageInstaller
 
         // perform after-install actions and emit post-install events
         $this->emitPostInstallEvents();
+
+        // Final verification: declared build-time tools should have been auto-installed by the
+        // pipeline above (they were merged into $this->packages in resolvePackages()). This only
+        // throws if a tool genuinely failed to become available (e.g. no artifact for this platform).
+        $this->ensureRequiredTools();
     }
 
     public function isBuildPackage(Package|string $package): bool
@@ -357,12 +359,16 @@ class PackageInstaller
         }
         // Fallback: if the download cache is missing (e.g. download failed or cache was cleared),
         // still check whether the files are physically present in buildroot.
-        // Note: TargetPackage extends LibraryPackage, but target packages (e.g. zig) have no
+        // Note: TargetPackage extends LibraryPackage, but target packages have no
         // static-libs/headers configured, so isInstalled() would trivially return true for them.
         // Only apply this fallback to pure library packages.
         if ($package instanceof LibraryPackage && !($package instanceof TargetPackage)) {
             return $package->isInstalled();
         }
+        // Tool packages: fall back to checking their provided binaries directly on disk.
+        if ($package instanceof ToolPackage) {
+            return $package->isInstalled();
+        }
         return false;
     }
 
@@ -511,6 +517,16 @@ class PackageInstaller
         }
 
         $status = $extractor->extract($artifact);
+
+        // Record the installed version for tool packages, so `check-update --installed` can
+        // compare against what's actually on disk instead of only the download cache (which
+        // only reflects the last download and may be stale or cleared). Recorded regardless of
+        // $status so the registry self-heals if it was deleted separately from the install dir.
+        if ($package instanceof ToolPackage) {
+            $cache_info = ApplicationContext::get(ArtifactCache::class)->getBinaryInfo($artifact->getName(), SystemTarget::getCurrentPlatformString());
+            ToolVersionRegistry::record($artifact->getName(), $cache_info['version'] ?? null);
+        }
+
         if ($status === SPC_STATUS_ALREADY_EXTRACTED) {
             return SPC_STATUS_ALREADY_INSTALLED;
         }
@@ -661,8 +677,8 @@ class PackageInstaller
      */
     private function validatePackageArtifact(Package $package): void
     {
-        // target and library must have at least source or platform binary
-        if (in_array($package->getType(), ['library', 'target']) && !$package->getArtifact()?->hasSource() && !$package->getArtifact()?->hasPlatformBinary()) {
+        // target, library and tool packages must have at least source or platform binary
+        if (in_array($package->getType(), ['library', 'target', 'tool']) && !$package->getArtifact()?->hasSource() && !$package->getArtifact()?->hasPlatformBinary()) {
             throw new WrongUsageException("Validation failed: Target package '{$package->getName()}' has no source or current platform (" . SystemTarget::getCurrentPlatformString() . ') binary defined.');
         }
     }
@@ -695,6 +711,32 @@ class PackageInstaller
             $this->packages[$pkg_name] = PackageLoader::getPackage($pkg_name);
         }
 
+        // Merge in build-time tool packages declared via 'tools'/'tools@platform' fields on the
+        // packages resolved above. Tools are intentionally NOT part of the library dependency graph
+        // (DependencyResolver), but still need to ride the normal download/extract/install pipeline
+        // so they get auto-installed like any other package.
+        //
+        // Tools are prepended so they install BEFORE any package that declares them — otherwise a
+        // library that invokes e.g. jom.exe during its build stage would fail because the tool
+        // hasn't been extracted yet (tools were appended after the dependency graph in insertion
+        // order, which is also the build-loop iteration order).
+        $tool_packages = [];
+        foreach ($this->collectRequiredTools() as $tool_name) {
+            if (isset($this->packages[$tool_name])) {
+                continue;
+            }
+            try {
+                $tool = PackageLoader::getPackage($tool_name);
+            } catch (WrongUsageException) {
+                continue; // will be reported as missing by ensureRequiredTools()
+            }
+            if ($tool instanceof ToolPackage) {
+                $tool_packages[$tool_name] = $tool;
+            }
+        }
+        // Prepend: tools first, then the dependency-resolved packages.
+        $this->packages = [...$tool_packages, ...$this->packages];
+
         foreach ($this->packages as $package) {
             $this->injectPackageEnvs($package);
         }
@@ -703,8 +745,12 @@ class PackageInstaller
     /**
      * Ensure all required tools are installed, throwing if any are missing.
      *
-     * Called early in the build pipeline (before download/extract).
-     * When tools are missing, lists them with install hints.
+     * Called at the end of run(), after the normal download/extract/build/install pipeline
+     * has had a chance to auto-install any tool package merged in resolvePackages(). This is
+     * a final safety net: it only throws if a declared tool still isn't available afterward
+     * (e.g. no artifact defined for the current platform, or the tool name doesn't resolve to
+     * a registered ToolPackage). "General" tools not declared via any package's 'tools' field
+     * (e.g. zig, musl-toolchain) are not covered here and remain purely Doctor-driven.
      */
     private function ensureRequiredTools(): void
     {
diff --git a/src/StaticPHP/Package/ToolPackage.php b/src/StaticPHP/Package/ToolPackage.php
index b78afa91..7e0e6ba3 100644
--- a/src/StaticPHP/Package/ToolPackage.php
+++ b/src/StaticPHP/Package/ToolPackage.php
@@ -5,8 +5,8 @@ declare(strict_types=1);
 namespace StaticPHP\Package;
 
 use StaticPHP\Config\PackageConfig;
+use StaticPHP\Runtime\SystemTarget;
 use StaticPHP\Util\FileSystem;
-use StaticPHP\Util\GlobalPathTrait;
 
 /**
  * Represents a build-time tool package.
@@ -26,6 +26,11 @@ use StaticPHP\Util\GlobalPathTrait;
  *       provides: [nasm.exe, ndisasm.exe]       # executables this tool installs
  *       binary-subdir: ''                        # subdirectory under install root (default: '')
  *       min-version: '2.16'                      # minimum required version (optional)
+ *
+ * Fields nested under 'tool' support the same '@windows'/'@unix'/'@macos'/'@linux' suffix
+ * overrides as top-level package fields (e.g. 'provides@windows' overrides 'provides' when
+ * building on Windows), useful when a tool provides differently-named binaries per OS
+ * (e.g. upx vs upx.exe).
  *     artifact:
  *       binary:
  *         windows-x86_64:
@@ -36,7 +41,44 @@ use StaticPHP\Util\GlobalPathTrait;
  */
 class ToolPackage extends Package
 {
-    use GlobalPathTrait;
+    /**
+     * Get the build root ('--prefix') for a tool that builds from source.
+     *
+     * Unlike LibraryPackage (which installs into BUILD_ROOT_PATH), tool packages that build
+     * from source (e.g. pkg-config, via UnixAutoconfExecutor/UnixCMakeExecutor) install into
+     * their own install root (PKG_ROOT_PATH by default), consistent with pre-built tool binaries.
+     */
+    public function getBuildRootPath(): string
+    {
+        return $this->getInstallRoot();
+    }
+
+    /**
+     * Tool packages don't produce headers for other packages to consume. Kept self-contained
+     * under the tool's own install root so a from-source build never accidentally picks up
+     * unrelated headers from BUILD_ROOT_PATH.
+     */
+    public function getIncludeDir(): string
+    {
+        return $this->getInstallRoot() . DIRECTORY_SEPARATOR . 'include';
+    }
+
+    /**
+     * Tool packages don't produce libraries for other packages to consume. Kept self-contained
+     * under the tool's own install root (see getIncludeDir()).
+     */
+    public function getLibDir(): string
+    {
+        return $this->getInstallRoot() . DIRECTORY_SEPARATOR . 'lib';
+    }
+
+    /**
+     * Where this tool's own executables live, i.e. {install-root}/{binary-subdir}.
+     */
+    public function getBinDir(): string
+    {
+        return $this->getBinaryDir();
+    }
 
     /**
      * Get the install root directory for this tool.
@@ -50,7 +92,7 @@ class ToolPackage extends Package
         if ($root = getenv($env_var)) {
             return $root;
         }
-        $config_root = $this->getToolConfig()['install-root'] ?? null;
+        $config_root = $this->getToolField('install-root');
         if ($config_root !== null) {
             return FileSystem::replacePathVariable((string) $config_root);
         }
@@ -65,7 +107,7 @@ class ToolPackage extends Package
      */
     public function getBinaryDir(): string
     {
-        $subdir = $this->getToolConfig()['binary-subdir'] ?? '';
+        $subdir = $this->getToolField('binary-subdir') ?? '';
         if ($subdir === '') {
             return $this->getInstallRoot();
         }
@@ -75,14 +117,15 @@ class ToolPackage extends Package
     /**
      * Get the list of executables this tool provides.
      *
-     * Reads from YAML 'tool.provides' field. Each entry is a bare filename
-     * (e.g. 'nasm.exe'), resolved relative to getBinaryDir().
+     * Reads from YAML 'tool.provides' field (with '@windows'/'@unix'/'@macos'/'@linux'
+     * suffix override support). Each entry is a bare filename (e.g. 'nasm.exe'), resolved
+     * relative to getBinaryDir().
      *
      * @return string[] Bare executable names (not full paths)
      */
     public function getProvides(): array
     {
-        return $this->getToolConfig()['provides'] ?? [];
+        return $this->getToolField('provides') ?? [];
     }
 
     /**
@@ -112,6 +155,20 @@ class ToolPackage extends Package
         return array_all($this->getProvides(), fn ($binary) => file_exists($this->getBinary($binary)));
     }
 
+    /**
+     * Get the version currently installed on disk, as recorded by ToolVersionRegistry when this
+     * tool's binary was last (re-)installed via PackageInstaller::installBinary().
+     *
+     * Returns null if the tool was never installed through the package installer (e.g. installed
+     * manually, or not installed at all), or if its artifact doesn't expose a version string.
+     * This reflects what's actually on disk, unlike the download cache which only reflects the
+     * last download and may be stale or cleared.
+     */
+    public function getInstalledVersion(): ?string
+    {
+        return ToolVersionRegistry::get($this->name);
+    }
+
     /**
      * Get the minimum required version for this tool, if specified.
      *
@@ -119,7 +176,7 @@ class ToolPackage extends Package
      */
     public function getMinVersion(): ?string
     {
-        $version = $this->getToolConfig()['min-version'] ?? null;
+        $version = $this->getToolField('min-version');
         return $version !== null ? (string) $version : null;
     }
 
@@ -148,4 +205,29 @@ class ToolPackage extends Package
         }
         return $config['tool'];
     }
+
+    /**
+     * Get a field from the nested 'tool' config block, honoring the same
+     * '@windows'/'@unix'/'@macos'/'@linux'/'@bsd'/'@freebsd' suffix override priority
+     * that PackageConfig::get() applies to top-level fields. This lets a tool declare a
+     * per-OS override, e.g. 'provides' + 'provides@windows', without needing platform-
+     * specific package config files.
+     */
+    private function getToolField(string $field): mixed
+    {
+        $tool = $this->getToolConfig();
+        $suffixes = match (SystemTarget::getTargetOS()) {
+            'Windows' => ['@windows', ''],
+            'Darwin' => ['@macos', '@unix', ''],
+            'Linux' => ['@linux', '@unix', ''],
+            'BSD' => ['@freebsd', '@bsd', '@unix', ''],
+        };
+        foreach ($suffixes as $suffix) {
+            $key = "{$field}{$suffix}";
+            if (isset($tool[$key])) {
+                return $tool[$key];
+            }
+        }
+        return null;
+    }
 }
diff --git a/src/StaticPHP/Runtime/Executor/Executor.php b/src/StaticPHP/Runtime/Executor/Executor.php
index a57e11e0..804b680f 100644
--- a/src/StaticPHP/Runtime/Executor/Executor.php
+++ b/src/StaticPHP/Runtime/Executor/Executor.php
@@ -5,12 +5,13 @@ declare(strict_types=1);
 namespace StaticPHP\Runtime\Executor;
 
 use StaticPHP\Package\LibraryPackage;
+use StaticPHP\Package\ToolPackage;
 
 abstract class Executor
 {
-    public function __construct(protected LibraryPackage $package) {}
+    public function __construct(protected LibraryPackage|ToolPackage $package) {}
 
-    public static function create(LibraryPackage $package): static
+    public static function create(LibraryPackage|ToolPackage $package): static
     {
         return new static($package);
     }
diff --git a/src/StaticPHP/Runtime/Executor/UnixAutoconfExecutor.php b/src/StaticPHP/Runtime/Executor/UnixAutoconfExecutor.php
index 2cce15c5..84d3ca07 100644
--- a/src/StaticPHP/Runtime/Executor/UnixAutoconfExecutor.php
+++ b/src/StaticPHP/Runtime/Executor/UnixAutoconfExecutor.php
@@ -10,6 +10,7 @@ use StaticPHP\Exception\SPCInternalException;
 use StaticPHP\Package\LibraryPackage;
 use StaticPHP\Package\PackageBuilder;
 use StaticPHP\Package\PackageInstaller;
+use StaticPHP\Package\ToolPackage;
 use StaticPHP\Runtime\Shell\UnixShell;
 use StaticPHP\Util\InteractiveTerm;
 use ZM\Logger\ConsoleColor;
@@ -22,7 +23,7 @@ class UnixAutoconfExecutor extends Executor
 
     protected PackageInstaller $installer;
 
-    public function __construct(protected LibraryPackage $package, ?PackageInstaller $installer = null)
+    public function __construct(protected LibraryPackage|ToolPackage $package, ?PackageInstaller $installer = null)
     {
         parent::__construct($package);
         if ($installer !== null) {
diff --git a/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php b/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
index d8ff5148..6d5e6343 100644
--- a/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
+++ b/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
@@ -11,6 +11,7 @@ use StaticPHP\Package\LibraryPackage;
 use StaticPHP\Package\PackageBuilder;
 use StaticPHP\Package\PackageInstaller;
 use StaticPHP\Package\TargetPackage;
+use StaticPHP\Package\ToolPackage;
 use StaticPHP\Runtime\Shell\UnixShell;
 use StaticPHP\Runtime\SystemTarget;
 use StaticPHP\Util\FileSystem;
@@ -40,7 +41,7 @@ class UnixCMakeExecutor extends Executor
 
     protected PackageInstaller $installer;
 
-    public function __construct(protected LibraryPackage $package, ?PackageInstaller $installer = null)
+    public function __construct(protected LibraryPackage|ToolPackage $package, ?PackageInstaller $installer = null)
     {
         parent::__construct($package);
         if ($installer !== null) {
diff --git a/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php b/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
index f79afb41..6ad51272 100644
--- a/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
+++ b/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
@@ -9,6 +9,7 @@ use StaticPHP\Exception\SPCInternalException;
 use StaticPHP\Package\LibraryPackage;
 use StaticPHP\Package\PackageBuilder;
 use StaticPHP\Package\PackageInstaller;
+use StaticPHP\Package\ToolPackage;
 use StaticPHP\Runtime\Shell\WindowsCmd;
 use StaticPHP\Util\FileSystem;
 use StaticPHP\Util\InteractiveTerm;
@@ -35,7 +36,7 @@ class WindowsCMakeExecutor extends Executor
 
     protected PackageInstaller $installer;
 
-    public function __construct(protected LibraryPackage $package)
+    public function __construct(protected LibraryPackage|ToolPackage $package)
     {
         parent::__construct($this->package);
         $this->builder = ApplicationContext::get(PackageBuilder::class);
diff --git a/src/StaticPHP/Runtime/Shell/UnixShell.php b/src/StaticPHP/Runtime/Shell/UnixShell.php
index 7d74f65f..8ecad042 100644
--- a/src/StaticPHP/Runtime/Shell/UnixShell.php
+++ b/src/StaticPHP/Runtime/Shell/UnixShell.php
@@ -6,6 +6,7 @@ namespace StaticPHP\Runtime\Shell;
 
 use StaticPHP\Exception\SPCInternalException;
 use StaticPHP\Package\LibraryPackage;
+use StaticPHP\Package\ToolPackage;
 use StaticPHP\Runtime\SystemTarget;
 use ZM\Logger\ConsoleColor;
 
@@ -40,9 +41,9 @@ class UnixShell extends Shell
     /**
      * Init the environment variable that common build will be used.
      *
-     * @param LibraryPackage $library Library package
+     * @param LibraryPackage|ToolPackage $library Library or tool package
      */
-    public function initializeEnv(LibraryPackage $library): UnixShell
+    public function initializeEnv(LibraryPackage|ToolPackage $library): UnixShell
     {
         $this->setEnv([
             'CFLAGS' => $library->getLibExtraCFlags(),