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-rw-r--r--ext/extmk.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/extmk.rb b/ext/extmk.rb
index dbc1c92e57..a9fad432bd 100644
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -380,7 +380,7 @@ else
end
if $extout
- RbConfig.expand(extout = "#$extout", RbConfig::CONFIG.merge("topdir"=>$topdir))
+ RbConfig.expand(extout = "#{$extout}", RbConfig::CONFIG.merge("topdir"=>$topdir))
if $install
dest = RbConfig.expand($rubylibdir.dup)
unless $destdir.empty?