diff --git a/prepare.php b/prepare.php
index 013c81998c..065aabe0a9 100755
--- a/prepare.php
+++ b/prepare.php
@@ -12,17 +12,18 @@
 $p->parseArguments($argc, $argv);
 
 
+# clean
 # clean old make.sh
-if (file_exists(__DIR__ . '/make.sh')) {
-    unlink(__DIR__ . '/make.sh');
-    unlink(__DIR__ . '/make-install-deps.sh');
-    unlink(__DIR__ . '/make-env.sh');
-    unlink(__DIR__ . '/make-export-variables.sh');
-}
+$p->cleanFile(__DIR__ . '/make.sh');
+$p->cleanFile(__DIR__ . '/make-install-deps.sh');
+$p->cleanFile(__DIR__ . '/make-env.sh');
+$p->cleanFile(__DIR__ . '/make-export-variables.sh');
+$p->cleanFile(__DIR__ . '/make-download-box.sh');
+$p->cleanFile(__DIR__ . '/cppflags.log');
+$p->cleanFile(__DIR__ . '/ldflags.log');
+$p->cleanFile(__DIR__ . '/libs.log');
+$p->cleanFile(__DIR__ . '/configure.backup');
 
-if (file_exists(__DIR__ . '/make-download-box.sh')) {
-    unlink(__DIR__ . '/make-download-box.sh');
-}
 
 // Sync code from php-src
 $p->setPhpSrcDir($homeDir . '/.phpbrew/build/php-' . BUILD_PHP_VERSION);
diff --git a/sapi/src/Preprocessor.php b/sapi/src/Preprocessor.php
index 6f915c45cd..556769f910 100644
--- a/sapi/src/Preprocessor.php
+++ b/sapi/src/Preprocessor.php
@@ -1223,4 +1223,13 @@ public function hasExtension(string $ext): bool
     {
         return isset($this->extensionMap[$ext]);
     }
+
+    public function cleanFile(string $file): bool
+    {
+        if (is_file($file)) {
+            unlink($file);
+            return true;
+        }
+        return false;
+    }
 }