diff --git a/src/SPC/builder/Extension.php b/src/SPC/builder/Extension.php
index c2d924b7..b250097b 100644
--- a/src/SPC/builder/Extension.php
+++ b/src/SPC/builder/Extension.php
@@ -9,6 +9,7 @@ use SPC\exception\RuntimeException;
 use SPC\exception\WrongUsageException;
 use SPC\store\Config;
 use SPC\store\FileSystem;
+use SPC\util\SPCConfigUtil;
 
 class Extension
 {
@@ -281,13 +282,23 @@ class Extension
     /**
      * Build shared extension for Unix
      *
+     * @throws FileSystemException
      * @throws RuntimeException
+     * @throws WrongUsageException
+     * @throws \ReflectionException
+     * @throws \Throwable
      */
     public function buildUnixShared(): void
     {
+        $config = (new SPCConfigUtil($this->builder))->config([$this->getName()]);
+        $env = [
+            'CFLAGS' => $config['cflags'],
+            'LDFLAGS' => $config['ldflags'],
+            'LIBS' => $config['libs'],
+        ];
         // prepare configure args
         shell()->cd($this->source_dir)
-            ->setEnv(['CFLAGS' => $this->builder->arch_c_flags ?? ''])
+            ->setEnv($env)
             ->execWithEnv(BUILD_BIN_PATH . '/phpize')
             ->execWithEnv('./configure ' . $this->getUnixConfigureArg(true) . ' --with-php-config=' . BUILD_BIN_PATH . '/php-config --enable-shared --disable-static')
             ->execWithEnv('make clean')
diff --git a/src/SPC/util/SPCConfigUtil.php b/src/SPC/util/SPCConfigUtil.php
index 2d018d16..cc888d9a 100644
--- a/src/SPC/util/SPCConfigUtil.php
+++ b/src/SPC/util/SPCConfigUtil.php
@@ -7,6 +7,9 @@ namespace SPC\util;
 use SPC\builder\BuilderBase;
 use SPC\builder\BuilderProvider;
 use SPC\builder\macos\MacOSBuilder;
+use SPC\exception\FileSystemException;
+use SPC\exception\RuntimeException;
+use SPC\exception\WrongUsageException;
 use SPC\store\Config;
 use Symfony\Component\Console\Input\ArgvInput;
 
@@ -21,6 +24,24 @@ class SPCConfigUtil
         }
     }
 
+    /**
+     * Generate configuration for building PHP extensions.
+     *
+     * @param array $extensions          Extension name list
+     * @param array $libraries           Additional library name list
+     * @param bool  $include_suggest_ext Include suggested extensions
+     * @param bool  $include_suggest_lib Include suggested libraries
+     * @return array{
+     *     cflags: string,
+     *     ldflags: string,
+     *     libs: string
+     * }
+     * @throws \ReflectionException
+     * @throws FileSystemException
+     * @throws RuntimeException
+     * @throws WrongUsageException
+     * @throws \Throwable
+     */
     public function config(array $extensions = [], array $libraries = [], bool $include_suggest_ext = false, bool $include_suggest_lib = false): array
     {
         [$extensions, $libraries] = DependencyUtil::getExtsAndLibs($extensions, $libraries, $include_suggest_ext, $include_suggest_lib);