https://github.com/termux/termux-packages/issues/15908

--- a/setup.py
+++ b/setup.py
@@ -306,8 +306,6 @@
         self.failed_on_import = []
         self.missing = []
         self.disabled_configure = []
-        if '-j' in os.environ.get('MAKEFLAGS', ''):
-            self.parallel = True
 
     def add(self, ext):
         self.extensions.append(ext)