1 files changed, 32 insertions, 0 deletions
diff --git a/ext/configsub.rb b/ext/configsub.rb
new file mode 100644
index 0000000000..315cdaf868
--- /dev/null
+++ b/ext/configsub.rb
@@ -0,0 +1,32 @@
+#!./miniruby -ps
+
+BEGIN {
+  CONFIG = {}
+
+  VERSION.scan(/(\d+)\.(\d+)\.(\d+)/) do
+    # overridden if config.status has version
+    CONFIG['MAJOR'] = $1
+    CONFIG['MINOR'] = $2
+    CONFIG['TEENY'] = $3
+  end
+
+  File.foreach($config || "config.status") do |$_|
+    next if /^#/
+    if /^s%@(\w+)@%(.*)%g/
+      name = $1
+      val = $2 || ""
+      next if /^(INSTALL|DEFS|configure_input|srcdir)$/ =~ name
+      val.gsub!(/\$\{([^{}]+)\}/) { "$(#{$1})" }
+      CONFIG[name] = val
+    end
+  end
+
+  CONFIG['top_srcdir'] = File.expand_path($srcdir || ".")
+  CONFIG['RUBY_INSTALL_NAME'] = $install_name if $install_name
+  CONFIG['RUBY_SO_NAME'] = $so_name if $so_name
+  $defout = open($output, 'w') if $output
+}
+
+gsub!(/@(\w+)@/) {CONFIG[$1] || $&}
+
+# vi:set sw=2: