diff --git a/config/pkg/ext/ext-spx.yml b/config/pkg/ext/ext-spx.yml
new file mode 100644
index 00000000..a379cdd4
--- /dev/null
+++ b/config/pkg/ext/ext-spx.yml
@@ -0,0 +1,14 @@
+ext-spx:
+  type: php-extension
+  artifact:
+    source:
+      type: pie
+      repo: noisebynorthwest/php-spx
+      extract: php-src/ext/spx
+    metadata:
+      license-files: [LICENSE]
+      license: GPL-3.0-or-later
+  depends:
+    - ext-zlib
+  php-extension:
+    arg-type: '--enable-SPX@shared_suffix@'
diff --git a/src/Package/Extension/spx.php b/src/Package/Extension/spx.php
new file mode 100644
index 00000000..bb230ec9
--- /dev/null
+++ b/src/Package/Extension/spx.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Extension;
+
+use Package\Target\php;
+use StaticPHP\Attribute\Package\BeforeStage;
+use StaticPHP\Attribute\Package\Extension;
+use StaticPHP\Attribute\PatchDescription;
+use StaticPHP\Package\PhpExtensionPackage;
+use StaticPHP\Util\FileSystem;
+
+#[Extension('spx')]
+class spx extends PhpExtensionPackage
+{
+    #[BeforeStage('php', [php::class, 'buildconfForUnix'], 'ext-spx')]
+    #[PatchDescription('Fix spx extension compile error when building as static')]
+    public function patchBeforeBuildconf(): bool
+    {
+        FileSystem::replaceFileStr(
+            "{$this->getSourceDir()}/config.m4",
+            'CFLAGS="$CFLAGS -Werror -Wall -O3 -pthread -std=gnu90"',
+            'CFLAGS="$CFLAGS -pthread"'
+        );
+        FileSystem::replaceFileStr(
+            "{$this->getSourceDir()}/src/php_spx.h",
+            "extern zend_module_entry spx_module_entry;\n",
+            "extern zend_module_entry spx_module_entry;;\n#define phpext_spx_ptr &spx_module_entry\n"
+        );
+        FileSystem::copy("{$this->getSourceDir()}/src/php_spx.h", "{$this->getSourceDir()}/php_spx.h");
+        return true;
+    }
+
+    #[BeforeStage('php', [php::class, 'configureForUnix'], 'ext-spx')]
+    #[PatchDescription('Fix spx extension compile error when configuring')]
+    public function patchBeforeConfigure(): void
+    {
+        FileSystem::replaceFileStr(
+            "{$this->getSourceDir()}/Makefile.frag",
+            '@cp -r assets/web-ui/*',
+            "@cp -r {$this->getSourceDir()}/assets/web-ui/*",
+        );
+    }
+
+    public function getSharedExtensionEnv(): array
+    {
+        $env = parent::getSharedExtensionEnv();
+        $env['SPX_SHARED_LIBADD'] = $env['LIBS'];
+        return $env;
+    }
+}