diff --git a/README.md b/README.md
index ec4a61c..78934db 100644
--- a/README.md
+++ b/README.md
@@ -19,10 +19,11 @@ Suppose your PHP package `foo/bar` relies on an external archive file (`examplel
   "extra": {
     "downloads": {
       "examplelib": {
-        "url": "https://example.com/examplelib-{$version}-{$os}-{$architecture}.{$extension}",
+        "url": "https://example.com/examplelib-{$version}-{$os}-{$architecture}${$musl}.{$extension}",
         "path": "extern/{$id}",
         "version": "1.1.0",
         "variables": {
+            "{$musl}": "PHP_OS === 'Linux' && musl() === true ? '-musl' : ''",
             "{$os}": "strtolower(PHP_OS_FAMILY)",
             "{$architecture}": "strtolower(php_uname('m'))",
             "{$extension}": "PHP_OS_FAMILY === 'Windows' ? 'zip' : 'tar.gz'",
@@ -108,6 +109,7 @@ Custom variable support these methods:
 * `str_starts_with`
 * `str_ends_with`
 * `matches`
+* `musl`
 
 #### Constants
 
diff --git a/src/Attribute/Validator/VariablesValidator.php b/src/Attribute/Validator/VariablesValidator.php
index 224c762..e6265a5 100644
--- a/src/Attribute/Validator/VariablesValidator.php
+++ b/src/Attribute/Validator/VariablesValidator.php
@@ -5,6 +5,7 @@
 use Composer\Package\PackageInterface;
 use LastCall\DownloadsPlugin\Attribute\AttributeManagerInterface;
 use LastCall\DownloadsPlugin\Enum\Attribute;
+use LastCall\DownloadsPlugin\Helper\MuslDetector;
 use Le\SMPLang\Exception;
 use Le\SMPLang\SMPLang;
 
@@ -27,6 +28,7 @@ public function __construct(
             'str_contains' => str_contains(...),
             'str_starts_with' => str_starts_with(...),
             'str_ends_with' => str_ends_with(...),
+            'musl' => new MuslDetector(),
             'matches' => fn (string $pattern, string $subject) => 1 === preg_match($pattern, $subject),
             'PHP_OS' => \PHP_OS,
             'PHP_OS_FAMILY' => \PHP_OS_FAMILY,
diff --git a/src/Helper/MuslDetector.php b/src/Helper/MuslDetector.php
new file mode 100644
index 0000000..7242b9f
--- /dev/null
+++ b/src/Helper/MuslDetector.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace LastCall\DownloadsPlugin\Helper;
+
+class MuslDetector
+{
+    public function __invoke(): bool
+    {
+        exec('ldd /bin/sh 2>&1', $output, $returnCode);
+        if (0 !== $returnCode) {
+            return false;
+        }
+        $ldd = trim(implode("\n", $output));
+
+        return str_contains($ldd, 'musl');
+    }
+}
diff --git a/tests/Unit/Helper/MuslDetectorTest.php b/tests/Unit/Helper/MuslDetectorTest.php
new file mode 100644
index 0000000..6d572de
--- /dev/null
+++ b/tests/Unit/Helper/MuslDetectorTest.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace LastCall\DownloadsPlugin\Tests\Unit\Parser;
+
+use LastCall\DownloadsPlugin\Helper\MuslDetector;
+use PHPUnit\Framework\TestCase;
+
+class MuslDetectorTest extends TestCase
+{
+    public function testInvoke(): void
+    {
+        $detector = new MuslDetector();
+        // @todo Test when the result is true
+        $this->assertFalse($detector());
+    }
+}