diff --git a/config/pkg/lib/imagemagick.yml b/config/pkg/lib/imagemagick.yml
index 10acadfaa..e0f68ce8a 100644
--- a/config/pkg/lib/imagemagick.yml
+++ b/config/pkg/lib/imagemagick.yml
@@ -23,6 +23,8 @@ imagemagick:
     - xz
     - libzip
     - libxml2
+  suggests@unix:
+    - lcms2
   headers@windows:
     - imagemagick/MagickWand/MagickWand.h
   lang: cpp
diff --git a/config/pkg/lib/lcms2.yml b/config/pkg/lib/lcms2.yml
new file mode 100644
index 000000000..b40782f98
--- /dev/null
+++ b/config/pkg/lib/lcms2.yml
@@ -0,0 +1,16 @@
+lcms2:
+  type: library
+  artifact:
+    source:
+      type: ghtagtar
+      repo: mm2/Little-CMS
+      match: lcms2\.\d+(\.\d+)?$
+    metadata:
+      license-files: [COPYING]
+      license: MIT
+  headers@unix:
+    - lcms2.h
+  pkg-configs:
+    - lcms2
+  static-libs@unix:
+    - liblcms2.a
diff --git a/src/Package/Library/imagemagick.php b/src/Package/Library/imagemagick.php
index 7e6604993..649894349 100644
--- a/src/Package/Library/imagemagick.php
+++ b/src/Package/Library/imagemagick.php
@@ -106,6 +106,7 @@ public function buildUnix(LibraryPackage $lib, ToolchainInterface $toolchain): v
             ->optionalPackage('zlib', ...ac_with_args('zlib'))
             ->optionalPackage('xz', ...ac_with_args('lzma'))
             ->optionalPackage('zstd', ...ac_with_args('zstd'))
+            ->optionalPackage('lcms2', ...ac_with_args('lcms'))
             ->optionalPackage('freetype', ...ac_with_args('freetype'))
             ->optionalPackage('bzip2', ...ac_with_args('bzlib'))
             ->optionalPackage('libjxl', ...ac_with_args('jxl'))
diff --git a/src/Package/Library/lcms2.php b/src/Package/Library/lcms2.php
new file mode 100644
index 000000000..11f111045
--- /dev/null
+++ b/src/Package/Library/lcms2.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Library;
+
+use StaticPHP\Attribute\Package\BuildFor;
+use StaticPHP\Attribute\Package\Library;
+use StaticPHP\Package\LibraryPackage;
+use StaticPHP\Runtime\Executor\UnixAutoconfExecutor;
+
+#[Library('lcms2')]
+class lcms2
+{
+    #[BuildFor('Darwin')]
+    #[BuildFor('Linux')]
+    public function buildUnix(LibraryPackage $lib): void
+    {
+        UnixAutoconfExecutor::create($lib)
+            ->configure()
+            ->make();
+
+        $lib->patchPkgconfPrefix(['lcms2.pc']);
+        $lib->patchLaDependencyPrefix();
+    }
+}
diff --git a/tests/StaticPHP/Command/Dev/GenExtTestMatrixCommandTest.php b/tests/StaticPHP/Command/Dev/GenExtTestMatrixCommandTest.php
index 4db6da59d..c638923fd 100644
--- a/tests/StaticPHP/Command/Dev/GenExtTestMatrixCommandTest.php
+++ b/tests/StaticPHP/Command/Dev/GenExtTestMatrixCommandTest.php
@@ -190,6 +190,20 @@ public function testForLibsFilterIncludesTransitiveLibraryDeps(): void
         }
     }
 
+    /**
+     * --for-libs must include extensions that depend on the library through suggested libraries.
+     */
+    public function testForLibsFilterIncludesTransitiveSuggestedLibraryDeps(): void
+    {
+        $matrix = $this->runMatrix(['--os' => 'Linux', '--for-libs' => 'lcms2']);
+
+        $this->assertNotEmpty($matrix, '--for-libs=lcms2 must yield at least one entry');
+        foreach ($matrix as $entry) {
+            $parts = explode(',', $entry['extension']);
+            $this->assertContains('imagick', $parts, "Entry {$entry['extension']} should not appear in --for-libs=lcms2 results");
+        }
+    }
+
     /**
      * Multiple filters should include entries matching any changed package.
      */
@@ -313,11 +327,14 @@ private static function buildFixture(): array
             'ext-xml' => $ext(['arg-type' => 'standard'], ['depends' => ['libxml2']]),
             'ext-dom' => $ext(['arg-type' => 'standard'], ['depends' => ['ext-xml']]),
 
-            // Transitive library chain: imagick -> imagemagick -> libheif -> libde265
+            // Transitive library chains:
+            // imagick -> imagemagick -> libheif -> libde265
+            // imagick -> imagemagick -> (suggests) lcms2
             'ext-imagick' => $ext(['arg-type' => 'standard'], ['depends' => ['imagemagick']]),
-            'imagemagick' => $lib(['depends' => ['libheif']]),
+            'imagemagick' => $lib(['depends' => ['libheif'], 'suggests' => ['lcms2']]),
             'libheif' => $lib(['depends' => ['libde265']]),
             'libde265' => $lib(),
+            'lcms2' => $lib(),
 
             // OS-restricted to Linux only
             'ext-linux-only' => $ext(['os' => ['Linux']]),
diff --git a/tests/StaticPHP/Registry/PackageLoaderTest.php b/tests/StaticPHP/Registry/PackageLoaderTest.php
index cb78cd181..8d8811338 100644
--- a/tests/StaticPHP/Registry/PackageLoaderTest.php
+++ b/tests/StaticPHP/Registry/PackageLoaderTest.php
@@ -4,6 +4,7 @@
 
 namespace Tests\StaticPHP\Registry;
 
+use Package\Library\lcms2;
 use PHPUnit\Framework\TestCase;
 use StaticPHP\Attribute\Package\Extension;
 use StaticPHP\Attribute\Package\Library;
@@ -28,26 +29,8 @@ protected function setUp(): void
         parent::setUp();
         $this->tempDir = sys_get_temp_dir() . '/package_loader_test_' . uniqid();
         mkdir($this->tempDir, 0755, true);
-
-        // Reset PackageLoader state
-        $reflection = new \ReflectionClass(PackageLoader::class);
-
-        $property = $reflection->getProperty('packages');
-        $property->setValue(null, null);
-
-        $property = $reflection->getProperty('before_stages');
-        $property->setValue(null, []);
-
-        $property = $reflection->getProperty('after_stages');
-        $property->setValue(null, []);
-
-        $property = $reflection->getProperty('loaded_classes');
-        $property->setValue(null, []);
-
-        // Reset PackageConfig state
-        $configReflection = new \ReflectionClass(PackageConfig::class);
-        $configProperty = $configReflection->getProperty('package_configs');
-        $configProperty->setValue(null, []);
+        $this->resetPackageLoaderState();
+        $this->resetPackageConfigState();
     }
 
     protected function tearDown(): void
@@ -58,25 +41,8 @@ protected function tearDown(): void
             $this->removeDirectory($this->tempDir);
         }
 
-        // Reset PackageLoader state
-        $reflection = new \ReflectionClass(PackageLoader::class);
-
-        $property = $reflection->getProperty('packages');
-        $property->setValue(null, null);
-
-        $property = $reflection->getProperty('before_stages');
-        $property->setValue(null, []);
-
-        $property = $reflection->getProperty('after_stages');
-        $property->setValue(null, []);
-
-        $property = $reflection->getProperty('loaded_classes');
-        $property->setValue(null, []);
-
-        // Reset PackageConfig state
-        $configReflection = new \ReflectionClass(PackageConfig::class);
-        $configProperty = $configReflection->getProperty('package_configs');
-        $configProperty->setValue(null, []);
+        $this->resetPackageLoaderState();
+        $this->resetPackageConfigState();
     }
 
     public function testInitPackageInstancesOnlyRunsOnce(): void
@@ -533,6 +499,26 @@ class TestPackage1 {
         $this->assertTrue(PackageLoader::hasPackage('test-lib'));
     }
 
+    public function testLcms2PackageRegistersBuildStageOnUnix(): void
+    {
+        if (PHP_OS_FAMILY === 'Windows') {
+            $this->markTestSkipped('lcms2 build stage is only registered for Unix in this test.');
+        }
+
+        try {
+            PackageConfig::loadFromFile(__DIR__ . '/../../../config/pkg/lib/lcms2.yml', 'test');
+            PackageLoader::initPackageInstances();
+            PackageLoader::loadFromClass(lcms2::class);
+
+            $package = PackageLoader::getLibraryPackage('lcms2');
+            $this->assertTrue($package->hasBuildFunctionForCurrentOS());
+            $this->assertTrue($package->hasStage('build'));
+        } finally {
+            $this->resetPackageLoaderState();
+            $this->resetPackageConfigState();
+        }
+    }
+
     private function removeDirectory(string $dir): void
     {
         if (!is_dir($dir)) {
@@ -561,4 +547,18 @@ private function createTestPackageConfig(string $name, string $type): void
         ];
         $property->setValue(null, $configs);
     }
+
+    private function resetPackageLoaderState(): void
+    {
+        $reflection = new \ReflectionClass(PackageLoader::class);
+        foreach (['packages' => null, 'before_stages' => [], 'after_stages' => [], 'loaded_classes' => []] as $propName => $value) {
+            $reflection->getProperty($propName)->setValue(null, $value);
+        }
+    }
+
+    private function resetPackageConfigState(): void
+    {
+        $configReflection = new \ReflectionClass(PackageConfig::class);
+        $configReflection->getProperty('package_configs')->setValue(null, []);
+    }
 }