c17 instead

src/SPC/builder/extension/mongodb.php

@@ -24,4 +24,9 @@ class mongodb extends Extension
         $arg .= $this->builder->getLib('zlib') ? ' --with-mongodb-zlib=yes ' : ' --with-mongodb-zlib=bundled ';
         return clean_spaces($arg);
     }
+
+    protected function getExtraEnv(): array
+    {
+        return ['CFLAGS' => '-std=c17'];
+    }
 }

src/SPC/builder/unix/library/gmp.php

@@ -12,7 +12,7 @@ trait gmp
     {
         UnixAutoconfExecutor::create($this)
             ->appendEnv([
-                'CFLAGS' => '-std=gnu99',
+                'CFLAGS' => '-std=c17',
             ])
             ->configure()
             ->make();

src/SPC/builder/unix/library/ncurses.php

@@ -16,7 +16,7 @@ trait ncurses
 
         UnixAutoconfExecutor::create($this)
             ->appendEnv([
-                'CFLAGS' => '-std=gnu99',
+                'CFLAGS' => '-std=c17',
                 'LDFLAGS' => SPCTarget::isStatic() ? '-static' : '',
             ])
             ->configure(