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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 8054e5eeb4..08053a9cb6 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2198,7 +2198,7 @@ def init_mkmf(config = CONFIG, rbconfig = RbConfig::CONFIG)
$extout ||= nil
$extout_prefix ||= nil
- @libdir_basename = config["libdir"][/\A\$\(exec_prefix\)\/(.*)/, 1] || "lib"
+ @libdir_basename = config["libdir"] && config["libdir"][/\A\$\(exec_prefix\)\/(.*)/, 1] or "lib"
$arg_config.clear
dir_config("opt")