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-rw-r--r--lib/mkmf.rb3
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index cba14ce57a..696609a6a4 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -153,8 +153,7 @@ def map_dir(dir, map = nil)
map.inject(dir) {|d, (orig, new)| d.gsub(orig, new)}
end
-topdir = File.dirname(libdir = File.dirname(__FILE__))
-extdir = File.expand_path("ext", topdir)
+topdir = File.dirname(File.dirname(__FILE__))
path = File.expand_path($0)
$extmk = path[0, topdir.size+1] == topdir+"/"
$extmk &&= %r"\A(?:ext|enc|tool|test(?:/.+))\z" =~ File.dirname(path[topdir.size+1..-1])