diff --git a/src/SPC/builder/Extension.php b/src/SPC/builder/Extension.php
index 459f5f02..6666c429 100644
--- a/src/SPC/builder/Extension.php
+++ b/src/SPC/builder/Extension.php
@@ -414,6 +414,7 @@ class Extension
         // prepare configure args
         shell()->cd($this->source_dir)
             ->setEnv($env)
+            ->appendEnv($this->getExtraEnv())
             ->exec(BUILD_BIN_PATH . '/phpize');
 
         if ($this->patchBeforeSharedConfigure()) {
@@ -422,6 +423,7 @@ class Extension
 
         shell()->cd($this->source_dir)
             ->setEnv($env)
+            ->appendEnv($this->getExtraEnv())
             ->exec(
                 './configure ' . $this->getUnixConfigureArg(true) .
                 ' --with-php-config=' . BUILD_BIN_PATH . '/php-config ' .
@@ -441,6 +443,7 @@ class Extension
 
         shell()->cd($this->source_dir)
             ->setEnv($env)
+            ->appendEnv($this->getExtraEnv())
             ->exec('make clean')
             ->exec('make -j' . $this->builder->concurrency)
             ->exec('make install');
@@ -577,4 +580,9 @@ class Extension
         }
         return $deps;
     }
+
+    protected function getExtraEnv(): array
+    {
+        return [];
+    }
 }
diff --git a/src/SPC/builder/extension/pgsql.php b/src/SPC/builder/extension/pgsql.php
index a70c1fb7..12545fd6 100644
--- a/src/SPC/builder/extension/pgsql.php
+++ b/src/SPC/builder/extension/pgsql.php
@@ -57,4 +57,11 @@ class pgsql extends Extension
         }
         return '--with-pgsql=' . BUILD_ROOT_PATH;
     }
+
+    protected function getExtraEnv(): array
+    {
+        return [
+            'CFLAGS' => '-Wno-int-conversion -Wno-implicit-function-declaration'
+        ];
+    }
 }