mkmf custom logging

gistfile1.diff

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 159df4a..8e4d92c 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -260,6 +260,7 @@ def xsystem command
     command = command.dup
     nil while command.gsub!(varpat) {vars[$1||$2]}
   end
+  File.open('mymkmf.log','a+') { |f| f.puts command.quote }
   Logging::open do
     puts command.quote
     system(command)