diff --git a/config/env.ini b/config/env.ini
index f81189ee..521d1e91 100644
--- a/config/env.ini
+++ b/config/env.ini
@@ -34,7 +34,6 @@
 ;   SPC_LINUX_DEFAULT_CXX:                  the default c++ compiler for linux. (For alpine linux: `g++`, default: `$GNU_ARCH-linux-musl-g++`)
 ;   SPC_LINUX_DEFAULT_AR:                   the default archiver for linux. (For alpine linux: `ar`, default: `$GNU_ARCH-linux-musl-ar`)
 
-
 [global]
 ; Build concurrency for make -jN, default is CPU_COUNT, this value are used in every libs.
 SPC_CONCURRENCY=${CPU_COUNT}
@@ -102,11 +101,11 @@ SPC_CMD_PREFIX_PHP_BUILDCONF="./buildconf --force"
 ; configure command
 SPC_CMD_PREFIX_PHP_CONFIGURE="./configure --prefix= --with-valgrind=no --disable-shared --enable-static --disable-all --disable-cgi --disable-phpdbg --with-pic"
 ; make command
-SPC_CMD_PREFIX_PHP_MAKE="make -j${CPU_COUNT}"
-; embed type for php, static (libphp.a) or shared (libphp.so)
-SPC_CMD_VAR_PHP_EMBED_TYPE="static"
+SPC_CMD_PREFIX_PHP_MAKE="make -j${SPC_CONCURRENCY}"
 
 ; *** default build vars for building php ***
+; embed type for php, static (libphp.a) or shared (libphp.so)
+SPC_CMD_VAR_PHP_EMBED_TYPE="static"
 ; CFLAGS for configuring php
 SPC_CMD_VAR_PHP_CONFIGURE_CFLAGS="${SPC_DEFAULT_C_FLAGS} -fPIE"
 ; CPPFLAGS for configuring php
@@ -137,9 +136,11 @@ SPC_CMD_PREFIX_PHP_BUILDCONF="./buildconf --force"
 ; configure command
 SPC_CMD_PREFIX_PHP_CONFIGURE="./configure --prefix= --with-valgrind=no --enable-shared=no --enable-static=yes --disable-all --disable-cgi --disable-phpdbg"
 ; make command
-SPC_CMD_PREFIX_PHP_MAKE="make -j${CPU_COUNT}"
+SPC_CMD_PREFIX_PHP_MAKE="make -j${SPC_CONCURRENCY}"
 
 ; *** default build vars for building php ***
+; embed type for php, static (libphp.a) or shared (libphp.dylib)
+SPC_CMD_VAR_PHP_EMBED_TYPE="static"
 ; CFLAGS for configuring php
 SPC_CMD_VAR_PHP_CONFIGURE_CFLAGS="${SPC_DEFAULT_C_FLAGS} -Werror=unknown-warning-option"
 ; CPPFLAGS for configuring php
diff --git a/src/SPC/builder/linux/LinuxBuilder.php b/src/SPC/builder/linux/LinuxBuilder.php
index d2445892..03158c1e 100644
--- a/src/SPC/builder/linux/LinuxBuilder.php
+++ b/src/SPC/builder/linux/LinuxBuilder.php
@@ -96,7 +96,7 @@ class LinuxBuilder extends UnixBuilderBase
         $envs_build_php = SystemUtil::makeEnvVarString([
             'CFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_CFLAGS'),
             'CPPFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_CPPFLAGS'),
-            'LDFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_LDFLAGS'),
+            'LDFLAGS' => '-L' . BUILD_LIB_PATH,
             'LIBS' => $config['libs'],
         ]);
 
@@ -336,11 +336,13 @@ class LinuxBuilder extends UnixBuilderBase
     private function getMakeExtraVars(): array
     {
         $config = (new SPCConfigUtil($this, ['libs_only_deps' => true, 'absolute_libs' => true]))->config($this->ext_list, $this->lib_list, $this->getOption('with-suggested-exts'), $this->getOption('with-suggested-libs'));
+        $static = SPCTarget::isStatic() ? '-all-static' : '';
+        $lib = BUILD_LIB_PATH;
         return [
             'EXTRA_CFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS'),
             'EXTRA_LIBS' => $config['libs'],
             'EXTRA_LDFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS'),
-            'EXTRA_LDFLAGS_PROGRAM' => SPCTarget::isStatic() ? '-all-static -pie' : '-pie',
+            'EXTRA_LDFLAGS_PROGRAM' => "-L{$lib} {$static} -pie",
         ];
     }
 
diff --git a/src/SPC/builder/macos/MacOSBuilder.php b/src/SPC/builder/macos/MacOSBuilder.php
index 50efa013..9b131b9d 100644
--- a/src/SPC/builder/macos/MacOSBuilder.php
+++ b/src/SPC/builder/macos/MacOSBuilder.php
@@ -116,7 +116,7 @@ class MacOSBuilder extends UnixBuilderBase
         $envs_build_php = SystemUtil::makeEnvVarString([
             'CFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_CFLAGS'),
             'CPPFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_CPPFLAGS'),
-            'LDFLAGS' => getenv('SPC_CMD_VAR_PHP_CONFIGURE_LDFLAGS'),
+            'LDFLAGS' => '-L' . BUILD_LIB_PATH,
             'LIBS' => $mimallocLibs . getenv('SPC_CMD_VAR_PHP_CONFIGURE_LIBS'),
         ]);
 
@@ -280,6 +280,7 @@ class MacOSBuilder extends UnixBuilderBase
         $config = (new SPCConfigUtil($this, ['libs_only_deps' => true]))->config($this->ext_list, $this->lib_list, $this->getOption('with-suggested-exts'), $this->getOption('with-suggested-libs'));
         return [
             'EXTRA_CFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS'),
+            'EXTRA_LDFLAGS_PROGRAM' => '-L' . BUILD_LIB_PATH,
             'EXTRA_LIBS' => $config['libs'],
         ];
     }
diff --git a/src/SPC/command/DownloadCommand.php b/src/SPC/command/DownloadCommand.php
index f77c80f9..dfa4c9ee 100644
--- a/src/SPC/command/DownloadCommand.php
+++ b/src/SPC/command/DownloadCommand.php
@@ -248,10 +248,9 @@ class DownloadCommand extends BaseCommand
                         $alt_sources = Config::getSource($source)['alt'] ?? null;
                         if ($alt_sources === null) {
                             logger()->warning("No alternative sources found for {$source}, using default alternative source");
-                            $alt_config = array_merge($config, $this->getDefaultAlternativeSource($source));
+                            $alt_config = array_merge($config, Downloader::getDefaultAlternativeSource($source));
                         } elseif ($alt_sources === false) {
-                            logger()->warning("No alternative sources found for {$source}, skipping alternative download");
-                            throw $e;
+                            throw new DownloaderException("No alternative sources found for {$source}, skipping alternative download");
                         } else {
                             logger()->notice("Trying to download alternative sources for {$source}");
                             $alt_config = array_merge($config, $alt_sources);
@@ -399,27 +398,4 @@ class DownloadCommand extends BaseCommand
         }
         return static::FAILURE;
     }
-
-    private function getDefaultAlternativeSource(string $source_name): array
-    {
-        return [
-            'type' => 'custom',
-            'func' => function (bool $force, array $source, int $download_as) use ($source_name) {
-                logger()->debug("Fetching alternative source for {$source_name}");
-                // get from dl.static-php.dev
-                $url = "https://dl.static-php.dev/static-php-cli/deps/spc-download-mirror/{$source_name}/?format=json";
-                $json = json_decode(Downloader::curlExec(url: $url, retries: intval(getenv('SPC_DOWNLOAD_RETRIES') ?: 0)), true);
-                if (!is_array($json)) {
-                    throw new RuntimeException('failed http fetch');
-                }
-                $item = $json[0] ?? null;
-                if ($item === null) {
-                    throw new RuntimeException('failed to parse json');
-                }
-                $full_url = 'https://dl.static-php.dev' . $item['full_path'];
-                $filename = basename($item['full_path']);
-                Downloader::downloadFile($source_name, $full_url, $filename, $source['path'] ?? null, $download_as);
-            },
-        ];
-    }
 }
diff --git a/src/SPC/command/InstallPkgCommand.php b/src/SPC/command/InstallPkgCommand.php
index b1ea3cd5..19d1532b 100644
--- a/src/SPC/command/InstallPkgCommand.php
+++ b/src/SPC/command/InstallPkgCommand.php
@@ -24,6 +24,8 @@ class InstallPkgCommand extends BaseCommand
         $this->addArgument('packages', InputArgument::REQUIRED, 'The packages will be installed, comma separated');
         $this->addOption('shallow-clone', null, null, 'Clone shallow');
         $this->addOption('custom-url', 'U', InputOption::VALUE_IS_ARRAY | InputOption::VALUE_REQUIRED, 'Specify custom source download url, e.g "php-src:https://downloads.php.net/~eric/php-8.3.0beta1.tar.gz"');
+        $this->addOption('no-alt', null, null, 'Do not download alternative packages');
+        $this->addOption('skip-extract', null, null, 'Skip package extraction, just download the package archive');
     }
 
     /**
@@ -66,10 +68,20 @@ class InstallPkgCommand extends BaseCommand
                         $new_config['filename'] = $config['filename'];
                     }
                     logger()->info("Installing source {$pkg} from custom url [{$ni}/{$cnt}]");
-                    PackageManager::installPackage($pkg, $new_config);
+                    PackageManager::installPackage(
+                        $pkg,
+                        $new_config,
+                        allow_alt: false,
+                        extract: !$this->getOption('skip-extract')
+                    );
                 } else {
                     logger()->info("Fetching package {$pkg} [{$ni}/{$cnt}]");
-                    PackageManager::installPackage($pkg, Config::getPkg($pkg));
+                    PackageManager::installPackage(
+                        $pkg,
+                        Config::getPkg($pkg),
+                        allow_alt: !$this->getOption('no-alt'),
+                        extract: !$this->getOption('skip-extract')
+                    );
                 }
             }
             $time = round(microtime(true) - START_TIME, 3);
diff --git a/src/SPC/store/Downloader.php b/src/SPC/store/Downloader.php
index 4bdb75fc..63d4a4cd 100644
--- a/src/SPC/store/Downloader.php
+++ b/src/SPC/store/Downloader.php
@@ -368,6 +368,11 @@ class Downloader
                     break;
                 case 'custom':          // Custom download method, like API-based download or other
                     $classes = FileSystem::getClassesPsr4(ROOT_DIR . '/src/SPC/store/pkg', 'SPC\store\pkg');
+                    if (isset($pkg['func']) && is_callable($pkg['func'])) {
+                        $pkg['name'] = $name;
+                        $pkg['func']($force, $pkg, SPC_DOWNLOAD_PACKAGE);
+                        break;
+                    }
                     foreach ($classes as $class) {
                         if (is_a($class, CustomPackage::class, true) && $class !== CustomPackage::class) {
                             $cls = new $class();
@@ -608,6 +613,29 @@ class Downloader
         return "{$source}-{$os_family}-{$gnu_arch}-{$libc}-{$libc_version}";
     }
 
+    public static function getDefaultAlternativeSource(string $source_name): array
+    {
+        return [
+            'type' => 'custom',
+            'func' => function (bool $force, array $source, int $download_as) use ($source_name) {
+                logger()->debug("Fetching alternative source for {$source_name}");
+                // get from dl.static-php.dev
+                $url = "https://dl.static-php.dev/static-php-cli/deps/spc-download-mirror/{$source_name}/?format=json";
+                $json = json_decode(Downloader::curlExec(url: $url, retries: intval(getenv('SPC_DOWNLOAD_RETRIES') ?: 0)), true);
+                if (!is_array($json)) {
+                    throw new RuntimeException('failed http fetch');
+                }
+                $item = $json[0] ?? null;
+                if ($item === null) {
+                    throw new RuntimeException('failed to parse json');
+                }
+                $full_url = 'https://dl.static-php.dev' . $item['full_path'];
+                $filename = basename($item['full_path']);
+                Downloader::downloadFile($source_name, $full_url, $filename, $source['path'] ?? null, $download_as);
+            },
+        ];
+    }
+
     /**
      * Register CTRL+C event for different OS.
      *
diff --git a/src/SPC/store/PackageManager.php b/src/SPC/store/PackageManager.php
index d5c1043d..dc662a5b 100644
--- a/src/SPC/store/PackageManager.php
+++ b/src/SPC/store/PackageManager.php
@@ -4,13 +4,14 @@ declare(strict_types=1);
 
 namespace SPC\store;
 
+use SPC\exception\DownloaderException;
 use SPC\exception\FileSystemException;
 use SPC\exception\WrongUsageException;
 use SPC\store\pkg\CustomPackage;
 
 class PackageManager
 {
-    public static function installPackage(string $pkg_name, ?array $config = null, bool $force = false): void
+    public static function installPackage(string $pkg_name, ?array $config = null, bool $force = false, bool $allow_alt = true, bool $extract = true): void
     {
         if ($config === null) {
             $config = Config::getPkg($pkg_name);
@@ -32,7 +33,31 @@ class PackageManager
         }
 
         // Download package
-        Downloader::downloadPackage($pkg_name, $config, $force);
+        try {
+            Downloader::downloadPackage($pkg_name, $config, $force);
+        } catch (\Throwable $e) {
+            if (!$allow_alt) {
+                throw new DownloaderException("Download package {$pkg_name} failed: " . $e->getMessage());
+            }
+            // if download failed, we will try to download alternative packages
+            logger()->warning("Download package {$pkg_name} failed: " . $e->getMessage());
+            $alt = $config['alt'] ?? null;
+            if ($alt === null) {
+                logger()->warning("No alternative package found for {$pkg_name}, using default mirror.");
+                $alt_config = array_merge($config, Downloader::getDefaultAlternativeSource($pkg_name));
+            } elseif ($alt === false) {
+                logger()->error("No alternative package found for {$pkg_name}.");
+                throw $e;
+            } else {
+                logger()->notice("Trying alternative package for {$pkg_name}.");
+                $alt_config = array_merge($config, $alt);
+            }
+            Downloader::downloadPackage($pkg_name, $alt_config, $force);
+        }
+        if (!$extract) {
+            logger()->info("Package [{$pkg_name}] downloaded, but extraction is skipped.");
+            return;
+        }
         if (Config::getPkg($pkg_name)['type'] === 'custom') {
             // Custom extract function
             $classes = FileSystem::getClassesPsr4(ROOT_DIR . '/src/SPC/store/pkg', 'SPC\store\pkg');