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-rw-r--r--lib/rubygems/ext/ext_conf_builder.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rubygems/ext/ext_conf_builder.rb b/lib/rubygems/ext/ext_conf_builder.rb
index a17881a890..18e300d8c2 100644
--- a/lib/rubygems/ext/ext_conf_builder.rb
+++ b/lib/rubygems/ext/ext_conf_builder.rb
@@ -38,7 +38,7 @@ class Gem::Ext::ExtConfBuilder < Gem::Ext::Builder
destdir = ENV["DESTDIR"]
begin
- cmd = [Gem.ruby, "-r", get_relative_path(siteconf.path), File.basename(extension), *args].join ' '
+ cmd = [Gem.ruby, "-I", File.expand_path("../../..", __FILE__), "-r", get_relative_path(siteconf.path), File.basename(extension), *args].join ' '
begin
run cmd, results