--- a/bin/stmkmf.rb	Fri Sep 21 23:19:25 2018 +0100
+++ b/bin/stmkmf.rb	Sat Sep 22 00:00:27 2018 +0100
@@ -36,7 +36,7 @@
     end
     top = match[1].rstrip()
   end
-  if not File.directory? top then
+  if not File.directory? File.join(cwd, top) then
     require 'pry'
     require 'pry-byebug'
     binding.pry