1 files changed, 7 insertions, 0 deletions
diff --git a/tool/expand-config.rb b/tool/expand-config.rb
new file mode 100755
index 0000000000..fb2edd02e8
--- /dev/null
+++ b/tool/expand-config.rb
@@ -0,0 +1,7 @@
+STDOUT.binmode
+ARGF.each do |line|
+  line.gsub!(/@([a-z_]\w*)@/i) {
+    (RbConfig::MAKEFILE_CONFIG[$1] or "").gsub(/\$\((.+?)\)/, %Q[${\\1}])
+  }
+  puts line
+end