fix fs_base

tests/runner.py

@@ -2745,7 +2745,7 @@ if 'benchmark' not in str(sys.argv):
           open(filename, 'w').write(src)
         src = 'int main() {return 0;}\n'
         expected = open(path_from_root('tests', 'filesystem', 'output.txt'), 'r').read()
-        self.do_test(src, expected, post_build=addJS)
+        self.do_test(src, expected, post_build=addJS, extra_emscripten_args=['-H', 'libc/fcntl.h,libc/sys/unistd.h'])
       finally:
         INCLUDE_FULL_LIBRARY = 0