This patch is taken from r1441 of rubygems's SVN repository to fix
rewriting of /usr/bin/env shebang patch with additional arguments to
the ruby interpreter. Without the patch the regexp would not match,
leaving the /usr/bin/env in place. This causes problems on platforms
that pass the remainder of the shebang line as a single argument, such
as Linux. See bug #199378 for all the details.

This patch should no longer be needed with rubygems 0.9.5.

--- lib/rubygems/installer.rb.~1~	2007-05-10 21:01:45.000000000 +0200
+++ lib/rubygems/installer.rb	2007-11-18 14:18:31.000000000 +0100
@@ -254,7 +254,7 @@
         path_to_ruby = File.join(Config::CONFIG['bindir'], Config::CONFIG['ruby_install_name'])
         if first_line =~ /^#!/
           # Preserve extra words on shebang line, like "-w".  Thanks RPA.
-          shebang = first_line.sub(/\A\#!\s*\S*ruby\S*/, "#!" + path_to_ruby)
+          shebang = first_line.sub(/\A\#!.*?ruby\S*/, "#!" + path_to_ruby)
         else
           # Create a plain shebang line.
           shebang = "#!" + path_to_ruby